223 



specifically. In practically every respect it agrees with the 

 description given on a previous page for irivinlis, except that 

 the ventral surface of the last tarsal joint has the spines 

 present, though weak. The length of the specimen is but 

 slightly over 2 mm., and in venation it is identical with the 

 female of tihialis, while its very dark color adds to the close- 

 ness of its agreement with tibialis. Unfortunately the 

 specimen is not in good condition, so it is not advisable to 

 attempt to specify very exactly what the normal characters 

 of the insect may be. Had Loew been def^cribing a male 

 instead of a female I should have had doubts as to the dis- 

 tinctness of suhaspcr from irivialis. 

 Originally described from New Mexico. 



Localities for subasper: Algonquin, Urbana, White Heath, 

 Savanna, St. Joseph, and Havana, Illinois. There is also a 

 single female in the collection here from New Orleans, Louisi- 

 ana, which was taken by Prof. S. A. Forbes. This last record 

 points to the fact that the species has a wide range, and 

 makes it the more probable that the Illinois specimens belong 

 to the same species which Coquillett had from New Mexico, 

 even though they are considerably larger than the size of 

 the type as given by him. 

 12. Mesonotum densely gray pollinose, without distinct brown spots or 

 vitta; legs with the exception of the tarsi almost entirely black- 

 brown. 



Female. — Black-brown, opaque. Head brown, on the occiput 

 and between the eyes gray pollinose; antennae brown. 

 ]Mcsonotum, pleurae, and scutellum gray pollinose, the 

 scutellum rather yellowish. Abdomen black-brown, slightly 

 shining, the surface whitish pollinose. Legs, including the 

 coxae, shining black-brown, tarsi yellow except the narrow 

 apices of the first four joints and all of the last joint, which 

 are black-brown. Wings slightly grayish, veins brown. 

 Halteres yellow. 

 Eyes very narrowly separated ; antennae slightly exceeding the 

 combined length of the head and thorax ; proboscis over half 

 as high as head. Mesonotum with irregular, backwardly 

 convergent, shallow furrows, or, rather, with slightly raised 

 ridges, on the anterior half of the disc ; discal hairs short 

 and not numerous ; above the base of the wing is a group of 

 black bristles which extends from in front of the wing-base 

 almost to the lateral posterior callosity, upon which there is 

 a single similar bristle; scutellum with numerous marginal 

 bristle-like hairs. Abdomen elongated, generally slightly 

 spatulate in form. Legs slender ; fore femora with an irregu- 

 lar double row of thorns on the apical half of the antero- 

 ventral surface; mid and hind femora with the thorns in a 



