Notes on Scale-Insects (Coccidae).—Part I

Scale insects

What are scale insects? Scale insects (Hemiptera: Sternorrhyncha: Coccoidea) are a group of small, plant feeding insects closely related to aphids and whiteflies. They are characterized by their unusual shapes, so much so that it is sometimes hard to recognize them as insects or even as animals! Adult females hardly ever move, lacking wings and often even legs. Instead of being able to run away...

Notes on Sandflies. Part I

I. Notes on Structured Programming

These notes have the status of "Letters written to myself": I wrote them down because, without doing so, I found myself repeating the same arguments over and over again. When reading what I had written, I was not always too satisfied. For one thing, I felt that they suffered from a marked verbosity. Yet I do not try to condense them (now), firstly because that would introduce another delay and ...

New cytogenetic data for some Palaearctic species of scale insects (Homoptera, Coccinea) with karyosystematic notes

New cytogenetic data are reported for 17 species from 15 genera of the families Pseudococcidae, Eriococcidae, Kermesidae, and Coccidae. Twelve species and 6 genera (Peliococcopsis Borchsenius, 1948, Heterococcopsis Borchsenius, 1948, Heliococcus Šulc, 1912, Trabutina Marchal, 1904, Lecanopsis Targioni Tozzetti, 1868, and Anapulvinaria Borchsenius, 1952) were studied cytogenetically for the firs...

Lecture Notes on Approximation Algorithms Volume I

These lecture notes are based on the course CS351 (Dept. of Computer Science, Stanford University) o ered during the academic year 1991-92. The notes below correspond to the rst half of the course. The second half consists of topics such as MAX SNP, cliques, and colorings, as well as more specialized material covering topics such as geometric problems, Steiner trees and multicommodity ows. The ...