560 AN INTRODUCTION TO ENTOMOLOGY 



F. Anterior branch of the radial sector in the fore wings forked. 



p. 562 HYDROPSYCHIDyE 



FF. Anterior branch of the radial sector simple, p. 564 



PSYCHOMYIDiE 



BB. Maxillary palpi with fewer than five joints. 



C. Maxillary palpi with four joints; ocelli present. Males, p. 564... 



PHRYGANEIDiE 



CC. Maxillary palpi with two or three joints. 



D. Maxillary palpi filiform, with cylindric smooth joints; fore tibiae 



with a single spur. Males, p. 568 Limnophilid/E 



DD. Maxillary palpi hairy or scaly, appressed against and often covering 



the face; fore tibiae with two spurs. Males, p. 569. . SERicosTOMAXiDiE 



TABLE OF TRICHOPTEROUS LARV^ 



The following table will aid in the classification of caddice-worms. It is 

 based on a more detailed table of the family characters of trichopterous larvae 

 given by Lloyd ('21). 



A. Anal prolegs not fused in median line to form an apparent tenth abdominal 

 segment. 



B. Abdomen much wider than the thorax, p. 561 Hydroptilid^ 



BB. Abdomen not much wider than the thorax. 



C. Dorsal surface of the ninth abdominal segment with a chitinous shield. 



p. 560 RHYACOPHILIDiE 



CC. Dorsal surface of the ninth abdominal segment without a chitinous 

 shield. 



D. Tracheal gills present, branched, p. 562 Hydropsychid^ 



DD. Tracheal gills absent. 



E. Labrum entirely membranous, white, p. 563. .Philopotamid^ 

 EE. Labrum entirely chitinized. 



F. Fronslong, extending back to the caudal margin of the head. p. 563 



POLYCENTROPID^ 



FF. Frons normal, p. 564 Psychomyid^ 



AA. Anal prolegs fused in median line so as to form an apparent tenth segment. 

 B. Dorsal surface of the labrum with a row of twenty or more heavy bristles. 



p. 567 Calamoceratid^ 



BB. Dorsal surface of labrum normal. 



C. Labrum much longer than broad, p. 567 Odontocerid^ 



CC. Labrum broader than long. 



D. Metanotum with three pairs of plates, p. 568 Limnophilid^ 



DD. Metanotum soft. 



E. Mesonotum soft or with one pair of minute plates, p. 564 



PHRYGANEIDyE 



EE. Mesonotum chitinized. 



F. Femur of hind legs divided into two segments or apparently so. 



p. 566 Leptocerid^ 



FF. Femur of hind legs not divided. 



G. p. 569 Sericostomatid^ 



GG. p. 566 MOLANIDiE 



Family RHYACOPHILID^ 



The larvae are campodeiform ; they Hve in rapidly flowing streams 

 with stony bottoms. The American species of this family represent 

 two subfamilies. The members of one subfamily, the Rhyacophilinae, 



