404 Introduction to Animal Morphology. 



has its prothorax three times the length of the meso- and 

 meta-thorax. 



§ 3. Saltatoria, leapers — female with an ovipositor (except 

 in Gryllotalpa) ; mostly winged. 4. Gryllidas — cylindrical^ 

 with thick, free head, elliptic eyes ; bristle-like antennae ; 

 maxillary palp with a vesicular point ; fore wing horizontal ; 

 hinder larger, closely folded ; hind leg long, thick ; fore 

 limbs are for burrowing in Gryllotalpa, or simple, gressorial, 

 and the prothorax smaller, as in Gryllus. Acheta, the house 

 cricket, belongs here. Platyblemma has a wide forehead. 

 5. Locustidae — wings, when in rest, imbricated; body long, 

 laterally compressed ; antennee bristle-like ; the males have 

 a sound-apparatus in the right elytron ; the hind legs are 

 long, with thick thighs. Schizodactylus has the wings elon- 

 gated, and spirally twisted behind. Here is included Dec- 

 ticus, the grasshopper. 6. Acrididse — head vertical ; body 

 laterally compressed ; elytrce small, with no sound-organs ;. 

 tarsi three-ijointed ; forehead with a longitudinal keel. CEdi- 

 poda migratoria is the destructive locust. 



§ 4. Corrodentia — wings homonomous, not capable of 

 folding together ; tarsi 2-3 jointed ; end segment of the lower 

 lip of two lobes. 7. Embidse — head longitudinal, free, four- 

 angled, with small eyes ; ocelli none ; prothorax narrow in 

 front ; tarsus three-jointed. The larvae spin cocoons in these 

 tropical forms. 8. Psocidae — head large, with a vesicular 

 forehead ; long bristle-like, 8-10 jointed antennae ; no maxil- 

 lary palps ; wings, when present, unequal, the hinder being 

 one-half the size of the fore. Troctes pulsatorius is the book- 

 louse or death watch. 



§ 5. Socialia — besides the winged sexual individuals, there 

 are apterous, sexless forms. 9. Termitidae (white ants) — 

 head free; antennae short; rosette-like; 13-20 jointed; 

 ocelli three ; outer maxillary lamina leaf-like ; tarsus four- 

 jointed ; males and females with delicate wings, apterous 

 workers, with small round head, and small mandibles, and 

 soldiers, with large square head, and sting mandibles, exist 

 in the colony. In impregnated females the abdomen is very 

 large. They build large hills of clay, cemented by their 

 saliva, within which are regular galleries. 



