359 



AGROMYZID^ 

 Agromyza aprii^ina^ n. sp. 



Female. — Glossy black. Frons opaque black, orbits and ocellar 

 triangle glossy; lunula yellowish; face and cheeks opac{ue, slightly 

 dusted with grayish pruinescence ; antennae, palpi, and proboscis black. 

 Thorax highly polished without trace of pruinescence'; scutellum as 

 disc of mesonotum. Abdomen as thorax, with a slight metallic blue 

 sheen towards apex. Legs entirely black. Squamae and fringes whit- 

 ish. Halteres yellow, knobs white. 



Head in profile as in Figure 4, Plate LXXXIV, frons over one 

 third the head-width, parallel-sided, orbits narrow, each about one fifth 

 as wide as center stripe, five moderately strong orbital bristles present, 

 which decrease slightly in strength towards anterior margin, orbits 

 otherwise bare; frontal triangle distinct, rather broad and short, not 

 extending midway to anterior margin ; antennae of average size, third 

 joint distinctly, but not greatly, longer than broad; arista swollen at 

 base, bare, its length exceeding that of anterior width of frons by about 

 one fourth; face and cheeks as shown in figure of profile. Mesonotum 

 with 4 pairs of dorso-central bristles, which decrease in size anteriorly, 

 the foremost pair being but little stronger than the strong discal hairs 

 of which there are about 6 irregular rows between the anterior dorso- 

 centrals ; the pair of bristles between the posterior pair of dorso-cen- 

 trals distinct. Abdomen elongate, discal hairs numerous and rather 

 strong; ovipositor stout and of moderate length. Legs normal in 

 length and in form; mid tibiae with the posterior pair of bristles 

 distinct. Costa extending slightly beyond third vein; outer cross-vein 

 slightly beyond middle of wing and a little more than its own length 

 from inner; inner cross-vein beyond end of first vein and two fifths 

 from apex of discal cell ; last section of fourth vein four times as long 

 as penultimate section ; last section of fifth five sixths as long as penul- 

 timate; auxiliary vein complete; sixth A^ein extending nearly to wing 

 margin. 



Male. — Agrees with the female in color. 



Differs from the female in the case of one specimen in having the 

 outer cross-vein at one seventh of the distance from inner cross-vein 

 to wing margin. 



Length: female, 3-3.5 mm.; male, 2.5 mm. 



Type locality, Cottonwood grove, Urbana, III, April 16-20, 191 5 

 (J. R. Malloch). 



In the key to the species of Agromyza in my paper in the Annals 

 of the Entomological Society of America this species will run down 



