430. ON THE TRIBES 



quentlyis not improbable that the Linnaean genus Tenthre- 

 do may hereafter be ascertained to constitute a type of that 

 order for which, until a better shall have been invented, we 

 must retain the name Trichoptera. This type seems to be 

 intermediate between the Perlidce, and Phryganidce, al- 

 though separated from each of them by a tribe of insects, 

 of which as yet I know nothing except from theory *. 



The genus Sialis comes so close to Nemoura in external 

 appearance, that nothing perhaps will exclude it from the 

 order of Trichoptera, except the circumstance of its having 

 neither an eruciform larva nor a truly cased metamorpho- 

 sis. It is therefore osculant, having a Neuropterous sco- 

 lopendriform larva and a Trichopterous imago. Hence, 

 if we retain for such insects M. Latreille's name of Me~ 

 galoptera, the order of 



Neuroptera 

 may be entered at the genus C/iauliodes, which may be 

 referred to Corydalis as the type of its tribe. The prin- 

 cipal forms among the Neuroptera, or those to which all 

 in the order appear referable, are probably, 1. Termes, 

 2. Corydalis, 3. Myrmeleon, 4. Libellula, 5, Panorpa. 



* Scarcely had the above been written, when Dr. Horsfeild, by a rather 

 singular coincidence, inquired of me where he- could procure any informa- 

 tion with respect to a larva found on plants and trees at Java. It covers it- 

 self with a tube of straws ^lued togeliier longitudinally, from which it occa- 

 sionally protrudes a head like that of a Caterpillar. He kept it alive in a 

 box for months, without beins; able to ascertain its perfect state. This is 

 clearly something allied to Phyganea, although not aquatic. Can it be 

 the larva of any insect which will occupy a place in one of the chasms 

 which I have indicated between Tenth edo and the aquatic Ttichnptera ? 

 I may here observe that M. Latreille has just announced a new Trichopte- 

 rous genus {Sencostcma) resemhWiig: the Lepidnptera \n the form and di- 

 rection of its labial palpi, but of which " la Larve est terreslre et logee dans 

 un tuyau en spirale." These circumstances show that it is nut tlie same 

 genus with Dr. Hoi-sfeild's Insect, but at the same time establish the im- 

 portant fact that the laivse of Triclioplera are not necessarily aquatic. 



