Art. X.] Hine, Pmiorpidae of America North of Mexico. 257 
The species of the genus differ in their food habits from the 
members of the genus Panorpa, as it is probable that they eat 
nothing but what they find living. Various insects are eaten 
by them, and there is no doubt that their predaceous habits 
make them of some value from an economic standpoint. Thus as 
they inhabit shady places along streams where mosquitos abound, 
it seems probable that mosquitoes form part of their bill of fare. 
The following key will assist in locating the eight species 
of our fauna: ' 
1. Both sexes wingless, ..... aptents. 
Both sexes with wings, ..... 2. 
2. Hind femora and tibia thickened, cross veins of wings (ex- 
cept not margined, ... 3. 
Hind femora slender, cross veins of the wings margined 
with fuscous, . . . . • . . 6. 
3. Large dark colored species, pterostigma bright yellow, 
chloro stigma. 
Smaller species pterostigma not bright yellow, . 4. 
4. Wings at base, and hind femora with black punctate spots, 
. , . . . . . . punctiger. 
Wings at apex fuscous, .... apicalis. 
Wings and hind femora unmarked, . . . 5. 
5. Male appendages not protruding beyond the last segment 
of the abdomen, rounded at the distal end, occidentis. 
Male appendages protruding beyond the last segment, 
turned inward at apex, . . . siigmaterus. 
6 . Antennae with long pile, wings tastaceous, with the cross 
veins narrowly margined with fuscous, pilico'tnis. 
Antennae with short pile, wings pale, with the cross veins 
broadly margined with fuscous, . . strigosus. 
BittaCUS apterUS McLachlan. 
Plate LX, Fig. /y. 
Bittacus apterus, McLachlan, Ent. Mo. Mag. 8-100; Osten 
Sackcn, Wein. Ent. Zeit. 1-123; McLachlan, Ent, Nach. 19- 
317; Hine, Jour. Cal, Hort. Soc. 13- no. 
Length of body 22 mm. male and female dark brown; head 
lighter in color than the thorax, ocelli prominent, not sur- 
