78 Psyche [April 
front; no dorsocentral macrochete, although there is a pair of larger bristly hairs 
on the posterior margin at this place. Scutellum large, truncate at the sides; shin- 
ing, without bristles, but with a series of short bristle-like appressed hairs in a close 
series along the hind margin; twice as broad as long. Mesopleura smooth, bare 
below, above polished and hairy like the mesonotum, with a large macrocheta at 
its upper hind angle. Abdomen broad and flat, the second and sixth segments 
lengthened as in P. pyrenaica; basal segments pruinose, but the sixth shining; no 
hairs or bristles, except at the sides of the fifth and sixth segments which bear hairs, 
and the posterior margin of the sixth which bears a series of short bristles. Hypo- 
pygium small, with a rounded upper surface, two finger-like processes from the left 
lobe; and several shorter processes from the right lobe. Legs rather slender, with- 
out bristles; tibial spurs represented by several minute bristles on the fore leg; 
those of the middle and hind tibize small, but quite distinct; fore and middle coxae 
below with a few bristles and hairs. Fore tibia much shortened and its tarsus 
flattened; the metatarsus nearly as long as the tibia. Wings large, with the costa 
reaching the middle, its bristles very short; third vein bristly as far as the fork, its 
Fig. 1 
Platyphora eurynota sp. nov., wing. 
2, Front lez of same side view. 
3. Front tibia and tarsus of same, external view. 
4. Antenna of same. 
5. Platyphora coloradensis sp. nov., wing. 
bristles almost as long as those on the costa. Third vein distinctly forked; thick 
ened for its entire length; costa thickened beyond the first vein which is very thin 
except on the extreme apical portion; heavy veins black; light veins fuscous. Fourth 
vein slightly curved and faintly recurved at apex; fifth running nearly parallel to 
the fourth and entering the wing margin just beyond the wing-tip; sixth much bent 
down on its apical half; seventh distinct. Halteres black, with the extreme base 
pale. 
