AQUATIC INSECTS IN THE ADIRONDACKS 563 



deals chiefly with the cases and the habits of a few species. Two of those 

 described by her seem to correspond with two described below, viz, 

 Molanna cinerea Hag. and Polycentropus lucidus Hag. 

 There have subsequently come to hand the very valuable papers ot 

 Prof. Klapalek^ in which the cases, larvae and pupae of 53 European 

 species are described. It is from these papers and from that ot 

 Dr Struck^ that the following table for the determination, by families, 

 of caddis fly larvae has been compiled. The undetermined species herein 

 described have been arranged according to this table. I regret exceed- 

 ingly that a closer determination has been impossible. The first three 

 species discussed below were reared and subsequently determined from 

 the adults. The fourth in the list was also reared. Its adult was sent to 

 MacLachlan but no report of its identification has yet been received. I 

 have found that adult characteristics are sufficiently evident in the pupae 

 to admit of determination, to families, by the use of Banks'^ table for 

 adults. 



For the identification of the adults herein listed, I am largely indebted 

 to Mr Nathan Banks of Washington D. C. The drawings of the cases, 

 larvae, pupae and adults are all by Mrs J. H. Comstock of Cornell uni- 

 versity. I am indebted most of all to Dr J. G. Needham, under whose 

 direction this work has been done. 



KEY TO FAMILIES OF CADDIS FLY LARVAE 



a Larva larviform, i. e. with head bent downward at an angle with the "body, 

 tubercles generally present on the basal abdominal segnient, gill filaments, 

 when present, simple (except in some Limnophilidae), lateral fringe gener- 

 ally present. 

 h Hind legs not more than twice as long as the first pair. 



c Head longitudinally elliptic, at slight angle with the body, pronotum only 

 ehitinized, abdominal constrictions deep, third pair of legs slightly 

 longer than the first. Cases of vegetable matter laid longitudinally 

 and forming a spiral, widening at the anterior end. ..Phry ga n e i dae 

 cr Head oval to round, pronotum ehitinized, mesouotum often, metauotum 

 seldom ehitinized, abdominal constrictions slight. 



d Lateral fringe well developed ; cases various Limnophilidae 



dd Lateral friuge slightly developed, cylindric case of sand or small 



stones Sericostomatidae 



e Thre^ tubercles 



' Klapalek Fr. Metamorphose der Trichoptereii, Arcliiv der Naturwissenschaftl. Landdurch- 

 forschung von Btihmen 6, Band No. 5 and Band 7, No. 6. 



- Struck, R. Neue und Alte Trichopteren-Larven-gehiiuse. Illus. Zelts. Eut. Bd 4. No. 8, 10, 13, 

 17, 19, 21, 22. 



3Banks, Nathan. A synopsis, catalogue, and bibliography of the Neuropterold Insects of tem- 

 perate North America. Am. ent. soc. Trans. 18'.t2. 19:338. 



