72 DIPTERA 
female decreasing in size but not forming an ovipositor. Legs pubescent, anterior legs simple, devoid 
of bristles, hind femora much swollen, with numerous irregular thorn-like setulze and setze beneath, 
hind tibize shortened and geniculate, pulvilli large. "Wings with prominent anal angle, costa evanescent 
beyond fourth vein, auxiliary vein very close to the first vein with which it combines, first vein ending 
much beyond the middle of the wing, third vein simple, pedicel of second and third veins very short, 
arising near the middle of the basal cells, discal cell emitting two veins, the fourth and fifth, second basal 
cell slightly longer than the first, its apical vein nearly transverse, anal crossvein perpendicular to the 
weak but complete anal vein. 
Genotype : L. univilíata, the following species. 
Geographical distribution. 
I. L. univitlata, nov. sp. (1). Kamerun. 
12. GeENUs STENOPROCTUS, LoEw 
Stenoproctus, Loew, Oefv. Vet. Akad. Fórh. Vol. 15, p. 340 (1858); Dipterenf, Südafr. Vol. r, p. 261 
(1860); Bigot, Ann. Soc. Ent. France (6), Vol. 9, p. 116 (1889); Kertész, Cat. Dipt. Vol.6, p. 12, 
(1909). 
Acanthopeza, Becker, Ann. Soc. Ent. France, Vol. 83, p. 122 (1914). 
Characters. — Black shining species measuring three millimeters, with hyaline wings and 
yellowish legs. Head globose, eyes of the female completely contiguous on the front; third joint of the 
antenne cylindrico-conical, twice as long as the combined basal joints, ending in a straight slender, 
neariy bare arista which is as long as the third joint and is tipped with a bristle; proboscis projecting 
horizontally forward, nearly as far as the head-height, palpi linear. "Thorax rather stout and highly 
arched, shorter than the abdomen, two scutellar bristles present. Hind legs lengthened, their femora 
incrassate and spinose beneath. hind tibi;& simple and curved, anterior legs simple. Wings with a 
prominent anal angle, first vein ending beyond the middle of the wing, a pronounced stigma present, 
second vein broadly sinuous but not steeply curving into the costa, pedicel of the second and third 
veins long, arising toward the base of the basal cells, discal cell small, emitting two posterior veins, 
basal cells long, the anterior much longer and narrower than the posterior, anal crossvein perpendicular - 
to the anal vein which attains the margin. 
Type species : S. uuipunciatus, Loew (PI. b, Fig. 44), the original genotype. 
(1) Lamachella univittata, nov. sp. — Female. Length 3 mm. Head black, antennz and mouthparts 
yellow, thorax except for a median vitta yellow, abdomen black, legs yellow, halteres blackish. Proboscis one-half 
as long as the head-height, porrect, constructed for piercing, palpi of the same length, spatulate and porrect. Median 
vitta of the thorax blackish-brown, not sharply defined, scutellum and metanotum blackish, a small humeral bristle 
present. Pubescence of the legs black, front tibi; somewhat inflated, a little thicker than the middle pair, all the 
tibiae with some projecting extensor hairs among the incumbent pubescence, middle tibiae with a small yellow apical 
flexor bristle, hind femora much swollen, thickest at the middle, studded with numerous setule beneath and with a 
row of setze along the posterior edge, hind tibiz three-fourths as long as their femora, tarsi not thickened. "Wings 
hyaline, veins brown, an elongate stigma visible, first four sections of the costa proportioned 1 : 0.3 ; 0.3 : 0.15, basal 
cells of equal width, second basal longer than the first because of the obliquity of its crossvein, sections of the fourth 
vein, 1 : 1.1, of the fifth vein, 1 : 0.8. 
One specimen, in the Museum of Comparative Zoology, Cambridge, Mass., received through T'rofessor Roland 
(Thaxter. Kamerun, Africa. : 
