374 
Psyche 
Xylota aristata n. sp. 
[December 
Head bluish black, face shining, with a pollinose spot on 
each side and white hairs on the cheeks, front slightly 
roughened and pollinose, narrowly margined with brown 
above the antennse, first and second joints of the antennae 
dark brown, the third joint light brown, arista white, the 
base with a slight yellow tinge. Thorax black, slightly rough- 
ened and with short blackish pubescence, pleura shining, 
scutellum black, slightly rugose. Abdomen dark blue, shin- 
ing, second and third segments margined posteriorly with 
an opaque black band that extends forward in the middle 
forming a broad triangle. Legs black with white hairs, pos- 
terior femora irregularly thickened with a cluster of spine- 
like bristles on the underside near the apex, posterior tibia 
strongly curved, with a prominent apical spur, under side of 
the tarsal joints with yellowish pubescence. Wings hyaline, 
base, stigma and veins dark brown, the cross-veins slightly 
clouded. Halteres light yellow. Length, 7 mm. 
One male, Jaffrey, May 18, 1925. Type in the collection 
of the Boston Society of Natural History. The species is 
readily recognized by its white aristae. 
Xylotomina chalybea Wied. June 16-28, 1917-‘23. 
X. curvipes var. satanica Bigot. June 15, ’23. 
X. pigra Fab. June 9, 1926. 
A', plesia Curr. June 12-22, 1923. 
X. vecors 0. S. June 15-19, 1917. 
Brachypalpus oarus Walk. ( frontosus Loew). May 16 and 
21, ’25, June 22, ’17. 
Criorhina intermedia John. Holotype. June 15-18, 1917. 
Cynorhina analis Macq. June 8-22, 1917-’23. 
C. badia Walk. June 16, 1923. 
C. confusa John. June 6-18, 1917-’20. 
C. nigra Will. May 16, ’25, June 18, 1917. 
Somula decora Macq. June 17-28, 1917. 
Sphecomyia vittata Wied. June 8-21, 1917’26. 
Temnostoma alternans Loew. June 15-21, 1917. 
T. balyras Walk. June 16-23, 1917-’23. 
T . bombylans Fab. June 21, 1917. 
