Neolabidophorus yucatanensis gen. et sp. n. and a new record for Dermacarus ornatus Fain, 1967 (Acarina: Glycyphagidae) from Heteromys gaumeri Allen and Chapman, 1897, Gaumer's spiny pocket mouse (Rodentia: Heteromyidae).

TWO species of hypopial nyrnphs of mites of the family Glycyphagidae were recovered from Heterorn!l.s gatlrneri froin Yucatan, hlexico. Numerous specimens of a hypopus identified as Dermacaru.~ ornattl.~ Fain were recovered from the hair and skin. A single specimen of an endoparasitic hypopus identified as a new genus and species, Neolabidophort~s !/z~catanensis, was recovered from the hair follicles. The new genus differs from similar forms of the subfamily Metalabidophorinae in having a rudimentary clasper organ represented by a median sclerite behind legs IV without external serrated claspers, structure and slightly dorsal position of the tarsal solenidia on legs I and 11, and a modified pair of subpalposoinal setae on the median venter. Hypopial nymphs of mites of the family Glycyphagidae were recovered from Gaumer's spiny pocket mouse, Heteromys gaumeri, from Yucatan, hlexico. Numerous specimens, representing a new host record, of Dermacarus omatus Fain were recovered from the skin and hair. Also, a new endoparasitic genus and species, Neolabidophorus yucntanensis, is described from the hair follicles of this host. In the following description all measurements are in microns. Drawings were made with the aid of a camera lucida. Setal designations follow those outlined by Fain (1969). Neolabidophorus gen. n. Family Glycyphagidae Berlese, 1887, Subfamily Metalabidophorinae Fain, 1967. Definition: Known only from the hypopus. Hair organ median, behind legs IV, well sclerotized, rudimentary, without serrated claspers, apparently nonfunctional. Genital suckers displaced laterally with their posteriors diverging outward. A secondary sclerot~zed plate located posteriorly on ventral surface. Epimera I well developed, fused, forming well-developed sternum. Epimera I1 strong. Tarsus I11 considerably longer than tarsus Received for publication 25 January 1974. * Department of Veterinary and Zoological Medicine, Texas Tech University School of Xledicine. 1 The hluseum, Texa\ Tech University, Lubbock, Texas 79409. IV. Two pairs subpalposomal setae (Ve?) located posteriorly to palposoma on venter. A pair of strong setae on tibiae I and 11, one on genua I and 11, and one on femur 11. A single barbed flattened seta on tibia 111, genu 111, and tibia IV. Palposoma with a pair of barbed setae. Claws I and I1 long and fine, curved at tip. Claws of tarsus 111 straight. Yo setae seen on dorsal idiosoma. Tarsal chaetotaxy: 4-4-8-3. Tibia1 chaetotaxy: 4-4-2-1. Type species: Neolabidophorz~s vucatanensis sp. n. Neolabidophorus yucatanensis sp. n. (Figs. 1-6) H ! l ~ ~ o p r ~ s (description based on a single specimen, the holotype) : Body small, cylindrical, white. Idiosoma 554 long, 285 wide (maximum). Anterior dorsal cuticle punctate, remainder of dorsal cuticle finely punctate, venter punctate in area of palposoma and epimera and epimerites, remainder of cuticle smooth. Dorsal sejugal furrow not seen. Coxosternal skeleton of legs I to IV well developed. Epimera I fused into a "I"' forming well-developed sternum, epinlera I 57 long, sternum 56 long. Epimera I1 free, 85 long. Epimerite I1 free. Epimera I11 and IV open and well sclerotized. Genital suckers widely separated, divergent posteriorly, 33 long. Hair organ rudimentary with several ridgelike structures but without hair claspers, probably nonfunctional, located just behind genital suckers. A secondary sclerotized plate on ventral opisthosoma posterior to the hair clasping organ extending a very short distance into dorsal opisthosoma. Palposoma with 1 pair short solenidia and a single pair of spinous setae. One FIGURES 1-(i. ~'eolahitlophortrr yitcatanensis gen. et sp. n. hypopus. 1. \'enter. 2. Dorsum. 3-6. Talsi, tibiae, genua, and femora of legs I, 11, 111, and IV, respectively. PENCE AND GENOWAYS-NEW MITE FROM GAUMER'S SPINY POCKET MOUSE, YUCATAN 713 714 THE JOURNAL OF PARASITOLOGY, VOL. 60, NO. 4, AUGUST 1974 pair subpalposomal setae barbed; one pair smaller, smooth. No setae seen on dorsal idiosoma, setae ga absent on venter, gm present on genital suckers. Legs I, 11, 111, and IV 94, 98, 83, and 47 long, respectively. Tarsi I and I1 terminating distally in a single curved claw 5 to 7 long. Tarsus I11 terminating in a single long straight spinelike claw. Tarsus IV without claws, with a single long tem~inal macroseta without serrations. Chaetotaxy of legs: Tarsus 4-4-8-3. Tibia 4-4-2-1. Genu 1-2-1-0. Femur 1-1-1-0. Trochanter 0-0-0-1. Terminal setae of tarsi I and I1 flattened, bladelike. A pair of large conical spinelike setae on tibiae I and I1 20 to 27 long, a single similar seta on genua I and I1 and femur I1 16 to 17 long. A single large flattened serrated or barbed seta on tibia and genu I11 28 to 31 long and a smaller conical seta on tibia IV serrated on one side. Remaining setae long and whiplike or short and spinelike. Solenidiotaxy: Trochanters, femora, genua, tibiae, and tarsi I11 and IV devoid of solenidia. Tarsus I with 2 ( w l and w,) solenidia and tarsus I1 with 1 ( w ~ ) solenidion 9, 16, and 13 long, respectively. Adults, larva: Unknown. Host: Heteromys gaumeri, Gaumer's spiny pocket mouse. Location: Endoparasitic in the hair follicles. Pathology : None apparent. Locality: 3 km north of Pistb, Yucatkn, Mexico. Holotype: USNM, Natural History, Acarology Collection. No. 3597.