160 Journal of the Mitchell Society [^I'hj 



123. Color strongly contrasted, niesonotum variegated C. cinctifrons Fitch 



Color not strongly contrasted, niesonotum unicolorous. . . .C. picta Van Duzee 



124. Carinse distinct on the mesonotum ; frontal ocellus usually evident 274 



SUBFAMILY CIXUX^ 125 



Carinse indistinct on tlie niesonotum ; frontal ocellus wanting 



SUBFAMILY DERBIN^ 172 



SUBFAMILY CIXIIN.E 



125. Posterior tibise armed with one to three spines before the apex 538. ... 126 

 Posterior tibi» without spines before the apex 539 149 



126. Posterior margin of the vertex broadly rounded, niesonotum tricarinate 



290 139 



Posterior margin of the vertex angulate, parallel to the posterior margin of 

 the angulate pronotum ; mesonotum usually quinquecarinate 274 



Genus Oliarus Stal 127 

 OLIARUS 



127. Fore wings pellucid, more or less mottled with brown 74 129 



Fore wings smoky brown, at least apically 75 128 



128. Fore wings uniform smoky brown, stigma and narrow costal margin pale; 



size larger, 8 mm Oliarus cinnamomeus Provancher 



Stigma and costal margin not paler ; apical third of the fore wings usually 

 sharply darker; size smaller, 6 mm 0. humilis Say 



129. Median tooth of the male pygofer simple, acute 569 132 



Median tooth of the male pygofer broadly expanded apically 566 130 



130. Vertex about as broad as median length ; male styles not broadly expanded 



apically 566 0. montanus Metcalf 



Vertex narrow, produced, genital styles of the male broadly expanded 

 apically 568 131 



131. Wing veins uniformly jtunctate, fuscous markings not confined to the veins 



and cross veins, female with a distinct fuscous longitudinal vitta at the 



apex of the fore wings O. pJaeitus Van Duzee 



Wing veins not uniformly punctate, fuscous markings confined to narrow 

 lines on the veins and cross veins 0. difficilis Van Duzee 



132. Fore wings distinctly and uniformly punctate 134 



Fore wings impunetate or nearly so 133 



133. Size smaller, 4-5 mm. ; fore wings nearly uniform in color, or infuscated 



apically 569 0. franciscanus Stal. 



Size larger, 8-9 mm.; fore wings with heavy fuscous markings, principally 

 on apical veins and cross veins 0. slossoni Van Duzee 



134. Frons with a broad white mark on either side next the base of the clypeus 



0. aridus Ball 

 Frons nearly unicolorous, carinir only paler 135 



