316 A. L. MELANDER. 



eves, becoming somewhat sparser on the occiput, hind ocelli but slightly further 

 apart than their distance to the eyes, ocellar triangle blackish; clypeus with a 

 pyramidal elevation on its posterior edge ; mandibles very robust; antennae as 

 long as head and thorax, scape concolorous with the head, flagellum fuscous. 

 Prothorax deeply and contiguously punctured, mesonotum subconfluently punc- 

 tured, the punctures coarse and deep, shining, with four deep polished grooves 

 abbreviated in front; metathorax strongly reticulate, the basal areas well 

 bounded, elongate; pleurae with finer punctures, the constrictions polished; 

 mesosternum with small, close punctures, deeply impressed medially and on each 

 side of this depression with a longitudinal row of seven denticles; vestiture of 

 thorax very sparse. Petiole of abdomen but little longer than broad at tip and 

 nearly sessile with the second segment, strongly convex, sparsely and rather 

 strongly punctured, the punctures elongate anterioily, ventrally with elongate 

 pits, the low median carina only slightly crenulate; second segment as strongly 

 punctured as the first, the punctures rather elongate ; remaining segments mi- 

 nutely but not confluently punctulate on outer half; pygidium sharply margined ; 

 second segment of venter with stronger and closer punctures than the second 

 dorsal, last ventral segment deeply and irregularly punctured ; vestiture sparse, 

 white, mostly erect, no apical fringes, hairs of last two segments yellow. Legs 

 normal, slightly paler than the body, tibial spurs testaceous, hind ones one-half 

 the length of the metatarsus, the sparse hairs white. Wings subhyaline, with a 

 yellowish tinge, veins testaceous, stigma fusco-testaceous, second submarginal 

 cell large, its outer border equal to its hind border, third submarginal nearly 

 obsolete. 



Length, 10 mm. 



Fig. 56 ; mesosternum. 



One male from the Peabody Collection of the Museum of Com- 

 parative Zoology, Cambridge, Mass. Captured in Texas, no definite 

 locality given. 



This species differs from M. Wheeleri, its nearest relative, by the 

 square shape of the head, sparser and deeper punctures of the head, 

 the unicolorous and more slender abdomen, which is covered with 

 erect white vestiture, by the paler wings and deeper seccnd submar- 

 ginal cell. 



81. Mulilla Wlieeleri sp. nov. 



Male. Rufotestaceous; head rounded, irregularly punctured, the vertex con- 

 fluently, hind ocelli nearer the eyes than each other ; pro- and mesothorax deeply 

 punctured, the grooves abbreviated anteriorly ; metathorax moderately reticulate, 

 the area as long as four areoles; mesosternum with a transversely rugose ridge 

 on each side of the median line; petiole subsessile. the punctures coarse in front, 

 posteriorly like those of the second segment, moderate ; vestiture simple, abdomen 

 castaneous apically ; wings cinerascent, third submarginal weak, veins blackish, 

 second submarginal elongate. 



Rufotestaceous; the ocellar triangle and the tips of the mandibles black;' a 

 transverse, medially emarginate, subapical, suffused fascia of the second abdom- 

 inal segment castaneous. Head rounded, moderately produced behind the eyes, not 



