The black onion fly was observed as an eneniy of onions as early as 1865, but no positive published records of similar injuries were brought to the writer's knowledge until more recent years. This fly is a native species, and although recorded as occurring in New Jersey, it has not attracted attention save in the States of Ohio, Illinois, Indiana, Pennsylvania, Wisconsin, and Minnesota, and there are, therefore, reasons for believing that it is practically restricted, at least as a pest, to the middle western region and does not extend very far east or south of the states mentioned.

Hyloicus luscitiosa race bombax nov.

Similar to eastern luscitiosa, both fore and hind wings considerably paler, the usual sagittate black dashes on the fore wing only about half normal size.

The present form is almost undoubtedly a western race of luscitiosa, a parallel to H. gordius oslari R. & J.

Holotype.—♀, Provo, Utah (Tom Spalding) and pupal skin from which it emerged, V-14-19, unique.

Male. Head and thorax deep black-brown, pleura tinged with lighter brown: the mesothorax broad for the size of the insect and with the axillary cords scarcely extended beyond tip of scutellum. Abdomen with segments 1-6 and the anterior half of 7 dull semibvaline whitish with traces of a fine ruddy dorsal line and lateral rows of small ruddy spots or streaks situated one on each segment in the central area: posterior half of 7 and 8-10 opaque pinkish brown, paler ventrally: forceps pale tinged with brown a prominent tubercle situated between the limbs at base:setae white unbanded. Fore legs with the femora light sepia-brown tibiae and tarsi dull whitish the former shaded slightly with sepia at base tibia rather long more than twice as long as the femur and subequal to the entire tarsus: mid and hindlegs whitish the femora tinged with brown, femora and tibiae subequal. Wings hvaline with a brown tinge at extreme base: veins and crossveins pale. Length of body, 5 mm : of forewing 5 mm.

In the Canadian Entolnologist for November, 1925, I reviewed tne Canadian species of Lydella Desv. As certain changes in the terminology therein proposed are necessary it seems advisable to review the related forms and present a key to the genera concerned. The species under discussion, with some exceptions, trace to Masicera Macq. in keys dealing with the Nearctic fauna and the key to the genera may be used to supplement those in Williston's Manual, 1908, and Coquillett's “Revision.”