158 
Psyche 
[Dec. 
those of caveleriei Navas by the absence of a trans- 
verse marking which joins the pterostigmal and apical 
bands at the anterior margin of the wing. The wings of 
this species resemble those of dimidiata Navas, bnt the 
body color differs very much. However, the specific 
characteristics cannot be determined with certainty until 
the structure of the 9th abdominal segment has been 
studied. 
Family Bittacid^: 
Genus Bittacus Latr. 
This genus has been represented in China (not includ- 
ing Formosa) by four species, of which sinensis was de- 
scribed by Walker, pieli by Navas, and triangularis and 
sinicus by Issiki. 
Bittacus planus n. sp. 
Figures 59, 60, 61, 63, 67 
Body light brown, vertex brown, with sooty brown 
marking enclosing ocelli; rostrum brown; meso-thorax 
with two sooty brown spots on each side dorsally. Fore 
wing: length, 20.2 mm.; width, 5.2 mm.; the wing apex 
broad, obtuse ; membrane light brown without markings, 
veins brown, cross veins slightly emarginated; ptero- 
stigma not very prominent, apical cross vein in the area 
between Cu2 and 1A absent. Hind wing: length, 17.5 
mm.; width, 4.2 mm.; similar to fore wing, except that 
there is only one cross vein between the pterostigma and 
B2. c? genitalia : preepiproct with V-shaped inner mar- 
gins, when seen from above, with truncated apex, the ap- 
ical margins being slightly concave, furnished with a series 
of short black bristles on its interior sides ; caudal end of 
coxopodites produced upward rather long with smooth 
apex; harpagones broad basally, very narrow and slen- 
der distally, with prominent inner process; sedeagus 
lobes on each side of the base of filum broaden towards 
apex with truncated tips; proctiger narrow towards 
apex, furnished with a bundle of short hairs ; the lower 
process very long, pointed towards its apex. 
