Trichoptera. 47 



maxillary palpi of both sexes five-jointed, strongly hairy, their last joint 

 neither bowed nor ringed; ocelli usually present. (Hydr6ptila.) 



HYDROPTfLIOE 



Rarely minute species; fore wings without or with solitary thickened projecting 

 hairs; marginal fringe shorter than width of wing; antennae almost always 

 longer than the fore wings 2 



2. Ocelli present; maxillary palpi with only weak hairs 3 



Ocelli absent 6 



3. Last joint of maxillary palpi divided into false ring-joints, curved and as long 



as the third and fourth joints together; front tibiae with no, two, or three 

 spurs. (THYACOPHILIDM and HYDROPSYCHIDJE, part; Banks, 



1907). (Philopotamus.) PfflLOPOTAMIIXE 



Last joint of maxillary palpi not ringed, rarely curved, subequal to the other 

 joints 4 



4. Front tibiae with one or no spur; middle tibiae with three or two spurs; maxillary 



palpi of male three-jointed, of female five-jointed, but of similar structure 

 in the two sexes. (Anabolia, Limnephilus.) (PI. 9, figs. 195, 196). 



LIMNEPHiLHXE 



Front tibiae with two or three spurs, posterior tibiae with four spurs; maxillary 

 palpi four- or five-jointed 5 



5. Maxillary palpi five-jointed, the basal two joints very short (Rhyacophila) 



RHYAcopHnmas 



Maxillary palpi of male four-jointed, of female five-jointed, the joints cylindrical, 

 the second joint not short, the palpi of the two sexes similar. (Neurdnia, 

 Phryganea.) . . '. PHRYGANEDX33 



6. Tibial spurs 3:4:4; maxillary palpi weakly hairy, five-jointed, the first and sec- 



ond joints very small, the last joint ringed and curved; antennae thickened. 

 (HYDROPSY CHID fit, part; Banks, 1907.) (Polycentropus.) 



POLYCENTROPODID^ 

 Usually two, never three, spurs on front tibiae 7 



7. Last joint of the five-jointed, scarcely hairy, maxillary palpi annulate and arcu- 



ate 8 



Last joint of the usually strongly hairy maxillary palpi neither ringed nor 

 curved 9 



8. First vein from the discal cell of the fore wing forked; maxillary palpi long and 



thin. (Hydropsyche, Macronema) (PL 9, fig. 197) . . .HYDROPSYCHnXflj; 



First fork wanting in both fore and hind wings; first joint of the maxillary 



palpi small. (HYDROPSYCHIDM, part; Banks, 1907) (Psychomyia). 



PSYCHOMYinXE 



9. Both median and discal cells of fore wings present and closed; maxillary palpi 



five-jointed. (Heteroplectron.) CALAMOCEROTHXE 



Median cell of fore wings absent 10 



10. Maxillary palpi of the male three-jointed, of the female five-jointed, of different 

 structure in the two sexes; antennae usually thick, hairy and with large basal 

 joint; wings thickly hairy, discal cell present. (Brachycentrus.) 



SERICOSTOMATIIX33 

 Maxillary palpi of both sexes five-jointed 11 



