162 
IOWA ACADEMY OF SCIENCES. 
prominent, black, shining, finely granulated. Ocelli close to 
inner angle of eye, of deep orange color, and imbedded in the 
somewhat lighter colored part of head. Just outside the ocelli 
there is a fine constriction, beyond which the yellow part of the 
head simply forms a light band between the black posterior part 
of the head and the eyes. In some cases this constriction is 
more distinct, giving the impression that the eye is placed dor- 
sally on a lateral tubercle. Antennse filiform, reaching about to 
base of second pair of wings; four basal segments light colored, 
except top of fourth which, with the remaining segments, is 
black. In some cases the fifth and sixth segments are also 
light colored, except the tip. The two basal joints enlarged as 
usual, third the longest of all, fourth, fifth, sixth and seventh 
joints about equal, eighth somewhat longer, ninth and tenth 
short, equal in length, and, including the tip of the eighth, 
somewhat enlarged. Terminal bristles small, nearly equal. 
Frontal cones prominent, moderately diverging, acutely pointed, 
furnished with hairs, black, tips sometimes whitish. Clypeus 
dark colored. 
Mouth-parts not prominent, terminal segment and tip of sec- 
ond black. Thorax prominent, convex. Pronotum short, com- 
paratively small, orange yellow; dorsulum same color as pro- 
thorax, but in some cases the posterior part tinged with black; 
widens posteriorly till it almost equals width of head and eyes; 
mesonotum orange yellow with central portion black. Sides of 
the thorax sometimes with black markings, the most prominent 
of which is a curved one opposite the metasternal spines, and 
another one in front of this. Dorsally the posterior part of the 
metathorax* is marked with four longitudinal black lines. 
Legs light colored, tibiae and torsi of first and second some- 
what darker, smoky; posterior tibiae and tarsi nearly the same 
color as the femora, slightly darkened in some cases. Posterior 
tibiae with strong black spines. The tibial spines in the others 
light colored. 
Wings comparatively long, extending over half their length 
beyond the tip of the abdomen. Pterostigma wanting, i. e., no 
enlargement at union of subcosta and costa. Discoidal portion 
of subcosta more than one-third as long as basal portion. Basal 
part of radius straight, the distal part curved slightly toward 
^Note.— T his part of the metathorax prohahly corresponds to the dorsal part of the 
first abdominal segment, which, according to Witlaczil, has coalesced with the meta- 
thorax. 
