1913] Townsend — Muscaid Parasites of the Cotton-Stainer and Other Lygaeids !'.'> 



ber at San Jacinto in the Chira valley, a little below Macacara, 

 there issued on October 29, 1912, two flies, a male and a female, 

 of Acaulona peruviana n. sp. 



Acaulona peruviana sp. nov. 



Length of body, about 7 mm.; of wing, about 6 mm. Light yellow to tawny yel- 

 low and deep golden. Face including parafacials silvery, with a golden sheen; 

 that of male hardly more golden than that of female. Parafrontals deep gold in 

 both sexes, frontalia dark brown to blackish. Antennae and palpi yellowish, 

 former tinged with brownish on front edge. Occiput golden. Thoracic scutum 

 broadly deep gold on borders and transverse suture, leaving the four broad sub- 

 coalescent vittae in two patches of blackish before and behind suture; the parts of 

 vittae in front of suture more distinctly defined, especially in the male, of which the 

 outer are shorter and broader, and well separated from the inner. Scutellum of 

 female dusky, narrowly yellowish on tip; that of male more yellowish, basal half or 

 less dusky. Pleurae and coxae silvery, with golden tinge. Abdomen of female 

 rather tawny yellowish to gold, that of male bright light yellow in a well-defined 

 elongate area on each side; irregular soft brownish median fascia, its sections widen- 

 ing posteriorly on hind margin of each segment, usually more conspicuously so in 

 female; last two segments (5 and 6) of female and last segment (6) of male wholly 

 yellowish; fifth segment of male largely dusky. Abdomen of male narrowed and 

 flattened, elongate; that of female widened, swelling on sides, arched. No true 

 abdominal macrochaetae, but the hairs of male in some cases simulate them. Fem- 

 ora largely yellow, the front ones least so and quite blackish above, the hind ones 

 dusky only on tip; rest of legs blackish. Tegulae yellow to golden, especially on 

 disc. Wings blackish on less than costal one-half, abruptly subhyaline on rest; 

 apical cell clear except sometimes on front margin and tip, closed in margin. 



This species seems more closely related to A. tehuantepeca 

 Towns, than to A. costata v.d.W. 



Described from two reared specimens, male and female, San 

 Jacinto, Chira valley, Piura department, Peru, issued October 29, 

 1912. These types will be deposited in the U. S. N. M. The 

 species is comparatively rare, only five specimens having been col- 

 lected by the writer in Peru during three years, these being four 

 females and one male as follows : — One female, Somate, Rio Chira, 

 November 18, 1910, on flowers of Telanthera sp.; one male on foli- 

 age, Chapaira, Rio Piura valley, May 21, 1911; two females, 

 Canada de Saman, Chira valley, February 11, 1912, on flowers of 

 Philibertella flava; and one small female (about 5 mm.), Sullana, 

 Chira valley, February 17, 1912, on foliage. 



This species will be difficult to distinguish from Xanthomelanodes 

 peruanus until one becomes familiar with the generic and specific 



