188 INSECUTOR INSCITI/E MENSTRUUS 



black-haired about the mouth ; facial depression highly polished, with but 

 few hairs on its lower part ; a yellowish pollinose transverse streak from 

 near lower end of facialia to eye-margin, a large subquadrate yellowish 

 pollinose spot resting against eingle formed by posterior margin of cheek 

 and eye-margin, a pair of very narrow pollinose stripes at sides of clypeal 

 ridge. Mesonotum piceous-black, a bright ferruginous ill-defined spot 

 close to humeri, a whitish line along transverse suture; surface strongly 

 polished anteriorly, more dull posteriorly and with faint gray pruinosity ; 

 hairs very line, black, their insertions minute, rather sparse anteriorly and 

 becoming denser toward scutellum ; humeri white-poUinose, lateral mar- 

 gins black-hciired, a patch of yellow hair just above wing-insertion, Scu- 

 tellum black and densely black-haired, some short yellovsnsh bristles low 

 dovra on posterior margin. Pleurae black, with patches of brownish yel- 

 low hair on propleurae, mesopleurae, on posterior coxae and at wing- 

 insertion. Abdomen dorseJly largely steel-blue, at the sides and beneath 

 with yellowish brown pollinose ornamentation, clothed v^th fine, mode- 

 rately dense, black hairs; first segment more shinmg than the others, 

 wholly steel-blue above, nairrowly margined behind toward the sides with 

 yellowish pollen, beneath with a few pollinose inorations ; second and 

 third segments blue in the middle, broadly pollinose at the sides and 

 beneath to the narrow ventral zone, this pollinosity with numerous, irreg- 

 ularly distributed steel-blue dots which have a tendency to coalesce; 

 fourth segment wholly brownish pollinose and with steel-blue dots, spars- 

 est on the disk. Legs wholly black, only the hind femora with a fringe 

 of brownish yellow hairs cJong ventral surface. Wings with the venation 

 normal, hyaline, tinged with brovsTi at base, along costa euid very strongly 

 toward the apex, the aneJ field clear. Alula deep brown and with a fine 

 pale meurgin. Calypteres black, with short creases and narrow dull 

 brown fringe. 



Length: Body about 27 nun., wing 20 mm. 



Two females: Ancon, Canal Zone, November 24, 1908 (A. H. 

 Jennings) ; Cristobal, Canal Zone, August 14, 1911 (Dr. S. A. Davis). 



Type, Cat. No. 19126, U. S. Nat. Mus. 



The host is unknown, but no doubt will prove to be one of the rodents 

 of this region. 



