56 S. W. WILLISTON, M. D. 



liaphria {DasyUis) saflTrana. 

 Laphria safrana Fabricius, Syst. Antl. 160, IS; Wiedemann, Dipt. Exot. i, 234, 

 4.; Auss. Zw. i, .'i04, 9. 



'^ , J . — Length 19-22 mm. Head black, concealed beneath abundant sul- 

 phur-yellow pile, on the sides of the face below, near the oral margin, with a small 

 quantity of black pile. Antennse yellowish red. Dorsum of thorax black, with 

 a slight bluish reflection ; humeri and post-alar callosities red ; the margins except, 

 in the middle in front, yellow pilose, leaving the black of the disk in tlie shape of 

 a spade of playing cards, in the middle of which on the suture there are two 

 small yellow pilose spots ; pleurae more pitchy black, with a small tuft of yellow 

 pile in front of the wings. Abdomen black and yellow, densely clothed with ap- 

 pressed golden-yellow pile; venter yellow, thinly pilose. Coxte and legs yellow 

 with yellow pile, the femora on their upper sides sometimes brownish or blackish. 

 Wings dark brownish, with sub-hyaline spots in the posterior cells. 



Four specimens, Fla. (Frazar, Pergande) ; N. C. (Prof. Comstock) 



Andreiiosoina fulvicanda Say. 



A comparison of specimens from Maine and California shows no ap- 

 preciable differences. 



Aiidreiiosoiua clialybca n. sp. 



9. — Length 10.5 mm. Head black; face and front thickly white dusted, the 

 former with sparse white hairs on the sides, the gibbosity with thin black bristles. 

 Antennse black. Beard white; occiput thickly white pollinose. Thorax black, 

 moderately shining, the dorsum with a slender median stripe and lateral markings 

 of grayish pollen; pleurse pollinose, with a shining spot; scutellum deep shining 

 blue-black. Abdomen bare, deep shining steel-blue, with violet and cobalt reflec- 

 tions; on the sides of the segments with sparse white pile. Legs deep steel-blue, 

 with long sparse white pile and slender black bristles (on the tibiae and tarsi). 

 Wings clouded on the outer part, hyaline at base; first posterior cell closed, or 

 nearly so, at the margin. 



One specimen, San Domingo (Frazar). 



Pogonosoma melanoptera Wied. 



A single specimen from Florida (Pergande) is evidently of this spe- 

 cies. It differs from P. clorsata Say in the wings being black and 

 broader, in the face being clothed with black, and in the dorsum of the 

 thorax being shining. 



In the following pages I give tables of the species from the United 

 States that are known to me, together with their descriptions. This will 

 comprise nearly all of the species now known from this region ; lists of 

 the remaining species recorded from the United States are added. It is 

 needless to state that only specimens in a fair state of preservation can be 

 determined from the tables and descriptions. The species are often difficult 

 enough to distinguish with good material, hence I have forborne to de- 



