90 



ENTOMOLOGY. 



ORDER XI. TRICHOPTERA* (Caddis-flies). 



The caddis-flies bear a still closer resemblance to the small- 

 er moths than Panorpa, though the larvae are less like cat- 

 erpillars than those of the Mecaptera. The caddis-flies 

 have a small, rounded head which in its general structure, 

 though presenting some notable differences, closely resem- 

 bles that of the smaller moths, even to the obsolete mandi- 

 bles, these insects taking no solid food in the imago state. 

 Hagen states that in Plectrotarsus gravenhorstii the pro- 

 boscis is greatly developed, and in certain other genera 

 is longer than the head and fitted to probe flowers. (In the 

 (Estropsidcs the maxillse and labium become aborted dur- 



FIG. 83. Caddis-fly (enlarged and natural size) and case-worm, a, case. 



ing the pupa state. ) The thorax is throughout much like 

 that of the smaller moths, the prothorax being small and 

 collar-like; the metanotum formed on the lepidopterous 



* SELECTED WORKS. 



Hagen, H. A. Synopsis of N. A. Neuroptera. 



McLachlan, R. A monographic revision and synopsis of the Trichoptera 



of the European fauna (London, 1874-1880). 

 Muller, F. Ueber die von den Trichopterenlarven der Provinz Santa 



Catharina verf ertigten Gohiiuse (Zeits. f. Wissen. Zool., xxxv., 1880). 

 Packard, A S (External anatomy, in third report U. S. Ent. Coinrn., 



1883, 344, Pis. LIX, LXI). 



