GKOIvOGY OF lyA SAIvLE COUNTY. 



91 



bug- also belong- here, as well as the Pediculid^ 

 or lice. 



Orthoptera, wing-s lying- straight along- the bEick. 

 The- Blattaria or cockroach; Phasmidae or Walking- 

 sticks; Mantidae or mantis: Gryllidae or crickets, 

 among them the curious Mole cricket; Locustidae or 

 Locusts — the true locusts; Acrydii or Destructive 

 locusts of many genera and species are included in this 

 section. Locustidae embraces the Katydid — Cyrto- 

 phyllus concavus and many g'rasshoppers. 



Neuroptera; wings four, membranous, net veined. 

 Many of these are small and little noticed, as the Pso- 

 cid«, found among old books and papers. Kphemerida 

 — May flies are very numerous along the Illinois and 

 the lake shores the last of May into June. 



Odonata — Dragon flies of sev^eral species, some 

 large. The larva live in water and come forth as flies 

 the second year. 



Sialids or Corydalis is found in the woods along 

 streams, the larva living in the water. It is ash g'ray, 

 four or five inches long; has a large head and powerful 

 jaws. 



Arachmida or spiders have eight legs, and are 

 divided into two parts instead of three, as are insects, 

 the head and thorax forming the first, the abdomen 

 the second and usually layer division. We have a 

 large number of genera and many species of these very 

 interesting insects, a description of which would form 

 a volume by itself. 



They deserve careful study, and will well re- 

 pay the time and labor spent in the investigation. 



Among' the most interesting, is the large gray 

 hairy field spider, clubione, which soon learns 

 to come for food. The g'reat white and black spider, 

 whose webs so often seen in the fall, are a marvel of 



