ENTOMOLOGY 899 
differing from that species in the more extensive dark color of the abdomen, the first tergite having 
a dark brown hind margin. 
Head: brownish black, ochre-yellow pollinose; an ill-defined transverse band on the vertex 
darker pollinose; frons about as long as wide; frontal callus broadly elliptical, widely separated 
from the eyes, mostly brownish black, with a dirty yellowish spot in the center of the lower half; 
face with two wide, median, brownish yellow, shiny calli which converge above the mouth so as 
to form a V; jowls with a small, triangular, blackish brown, shiny area close to the lower margin 
of each eye; pilosity of the head sparse, mostly yellowish, darker on the frons and vertex; ocellar 
triangle flat, not raised into a callosity. Proboscis about as long as the height of the head; palpi 
tawny-ochraceous, the apical segment lanceolate, as in C. dimidiata. Antennae dark brown (the 
first segment dirty yellow at base), very long and slender, much as in C. silacea, but the second 
segment somewhat more swollen and markedly thicker than the base of the first; the first one and 
one-fourth times as long as the second; (third missing in the type). Thorax dorsally subshiny, 
with a rather faint, light yellowish-gray pollinose, broad, continuous, median stripe which is 
subdivided by a narrow median darker line; in addition a yellowish pollinose stripe on each side 
above the wings; pleura and sternum with yellowish pollinose spots partly covered with golden 
yellow hair; disk of scutellum yellowish-gray pollinose. Abdomen dorsally mostly dark brownish 
to blackish brown; first tergite broadly pale yellow at the base and on the sides, with the hind 
margin blackish, more narrowly so in the middle; a regular, rather wide, mid-dorsal, pale straw- 
yellow stripe runs from the base of the second tergite to the apex of the fourth; a narrower and more 
irregular stripe of the same color runs on each side near the brownish black lateral margins 
from the base of the first to slightly beyond the third tergite; venter largely straw-yellow, with a 
median blackish stripe which is narrow on the second tergite and much wider beyond; pilosity of 
the dark parts black, very sparse on the paler areas. Legs pale reddish brown; the coxae and ter- 
minal segments of the tarsi slightly infuseated; all the tibiae distinctly dilated, those of the fore legs 
more swollen than the others. Wing fairly uniformly infuscated (blackish brown) in the apical 
half, from the tips of the basal cells on; a lighter streak in the first submarginal cell, extending 
from the stigma to the fork of the third vein, and a smaller light spot in the fifth posterior cell 
base of wing (as far as extreme base of basal cells), entire costal and subcostal cells, as well as a 
narrow margin along the fifth longitudinal vein, of a paler brown color. 
Male. — Length, 12.6 mm.; width of head, 4.56 mm.; length of wing, 10.5 mm. 
Head large; eyes contiguous for some distance; triangle of vertex large; ocelli prominent; 
area of enlarged facets extensive, division between small and large facets very plainly marked, the 
small facets occupying about one-third of each eye beneath the enlarged facets; the one specimen 
seen shows a dark band somewhat in front of the posterior eye border and parallel to it, and a 
spot of the same color some distance before the band. Antennae somewhat more slender than in 
the female; palpi minute. Color of body, wings and legs and its arrangement the same as in the 
female, the only apparent difference being that the mid-dorsal yellow stripe of the abdomen is 
wider and more conspicuous and that there is more black on the apical segments ventrally. 
BELGIAN Conco. — Stanleyville, one female, holotype, one male, allotype, 
and four females, paratypes, as prey of Bembix bequaerti Arnold var. dira Arnold 
(H. Lang and J. P. Chapin). 
C’. langi is closely allied to both C. silacea Austen and C. dimidiata van der 
Wulp, from which it may be distinguished by the more uniform infuscation of 
the apical half of the wing and the different color pattern of the abdomen. 
Chrysops stigmaticalis Loew 
Chrysops stigmaticalis Loew, 1858, Ofvers. Vet. Ak. Férhandl., Stockholm, XIV, (1857), p. 338 
(9; Caffraria); 1860, ‘Dipteren-Fauna Sidafrikas,’ I, p. 29, Pl. I, fig. 18 (9). Austen, 1909, 
‘Tilustr. African Blood-Suck. Flies,’ p. 45, Pl. II, fig. 11 (¢). Kréber, 1927, Zool. Jahrb., 
Abt. Syst., LITI, pp. 181, 186, and 235, fig. 9, Pl. III, fig. 23 ( 9 @). 
Chrysops fuscus Ricardo, 1902, Ann. Mag. Nat. Hist., (7) IX, pp. 367 and 368 (<7, erroneously 
described as ?; Salisbury, Southern Rhodesia). J. Bequaert, 1913, Rev. Zool. Afric., H, 3, 
Dy 222, fig. 3 Co): 
Chrysops distinctipennis J. Bequaert, 1913, Rev. Zool. Afric., II, 3, p. 222, fig. 4 (9). Not of 
Austen. 
