6 PROCEEDINGS OF THE NATIONAL MUSEUM vol.73 



nearer to suture, and the intradorsocentral hairs farther apart. Fore 

 femora with two or three fine posteroventral. bristles. Venation as in 

 Figure 3. 



Length, 3.5 mm. 



One female, Trinidad Kio, Panama, March 23, 1912 (A. Busck). 



Type.— Cat. No. 40709, U.S.N.M. 



ASILOSTOMA ATRICEPS, new species 



Female. — Head black, upper portion of frons to below the upper 

 orbital bristle on sides and to a point a little higher in middle dis- 

 tinctly shining, anterior portion deep velvety black, with a white 

 dusted mark on each margin above level of bases of antennae; face 

 glossy, with a purple tinge; basal two antennal segments testaceous 

 yellow, third fuscous ; aristae white, the long hairs at base above dark ; 

 palpi fuscous. Thorax pale brown, more or less dusted on dorsum 

 and not noticeably shining except on sides of mesonotum, propleura, 

 scutellum, and metanotum testaceous yellow, a large mark in front 



Figs. 3-4. — 3. Wing of a.silostoma pallipes. 4. Head of asilostoma 



PALLIPES from side 



of each wing base velvety black. Abdomen brown, shining. Legs 

 pale stramineous, the fore tarsi palest. Wings grayish hyaline, with 

 faint brown clouds along fifth vein, outer cross vein, apex of second 

 vein, and on a short subapical section of third and fourth veins. Hal- 

 teres yellow. 



Vertex with inner pair of bristles long and strong, outer pair 

 lacking, post verticals minute, anterior orbital bristles very small; 

 third antennal segment about six times as long as wide; arista long 

 haired basally above, the hairs decreasing rapidly in length apically, 

 the lower side short haired ; face in tj^pe damaged, but evidently not 

 so much swollen as in some of the other species. Thorax normal, the 

 two pairs of dorsocentral bristles long and strong. Legs long, fore 

 tarsi thickened. Inner cross vein a little bej^ond middle of discal 

 cell ; second vein slightly arched with costa, third and fourth slightly 

 convergent on apical sections to near apices. 



Length 2.T5 mm. 



One female, Higuito, San Mateo, Costa Rica (P. Schild). 



Type.— Cat. No. 40954, U.S.N.M. 



