ART. 9 TWO-WIXGED FLIES OF TEIBE MILTOGRAMMINI ALLEN 47 



three irregular spots on each segment but never occurring in even, 

 sharply defined basal bands; strong marginal abdominal bristles 

 present, no discals. Genitalia of male (pi. 1, figs. 1, 2) small, in re- 

 pose retracted \\dthin abdomen so as to be scarcely visible in profile 

 view; females with the usual retracted larvipositors, without piercing 

 parts. Wings with the apical cell open; fourth vein with a distinct 

 fold at the bend; last section of fifth vein not more than half length 

 of preceding section; costal spine wanting; only third vein bristly, 

 and this with row of small bristles usually extending at least half 

 way to small cross vein. Pul villi of about equal size in both sexes 

 and usually less than half as long as last tarsal joint; fore tarsus of 

 male frequently ornamented with several long erect bristly hairs (pi. 

 3, fig. 19) ; middle tibia with not more than one macrochaeta on outer 

 front side near middle. 



To^vnsend ^^ dissected one species of the genus and found that it 

 possesses the typical double-pouched uterus of the Miltogramminae. 

 Thompson ^^ who has studied the first instar maggots of leucocepliala, 

 lateralis, and campestris found that all possess a buccopharyngeal 

 apparatus with a strong median stylet which articulates on the very 

 slender dorsal accessory piece, two weak lateral hooks and the basal 

 piece, the latter fused without articulation to the intermediate 

 piece. The cuticula of each segment is armed anteriorly by a band 

 ot minute, flattened, transparent scales, and posteriorly by a wider 

 band of longitudinal corrugations. 



The genus is represented in Europe, North and South America. 

 In North America it does not have so extensive a range as Senotainia, 

 not being known north of Grand Lake, Newfoundland, southern 

 Quebec and Kaslo, British Columbia, or south of Cuba and Guerrero, 

 Mexico. 



The adults frequent denuded soil, low herbaceous vegetation, and 

 in the case of some species, the foliage of shrubby plants in open 

 forests. They are not known to be attracted to flowers but some 

 species are drawn, in large numbers, to foliage smeared with the 

 honeydew of Hemipterous insects. These flies are biologically 

 superimposed upon fossorial Hymenoptera which nest in the ground, 

 and have been reared from or found associated with species of several 

 families including the Halictidae, Sphecidae, Bembicidae, and 

 Cerceridae. 



" An. Ent. Soc. Amer., vol. 4, p. 130, 1911. 



" Paris Edition du Bull. Biol, de la France et de la Belgique, Recherches sur les Dipteres Parasites, 

 pp. 110-114, 1921. 



