AKT. 17. NOETH AiMERICAN PHOROCERA — ALDRICH AND WEBBER, 55 



about half as lonor as the adjacent marfiinal. Abdomen with white 

 pollen which covers more than half of the second and third seg- 

 ments above; on the fourth segfnent it is very dense on the basal 

 two-fifths but stops suddenly at the side, the remainder of the seg- 

 ment above, and the whole of it below, shining black; second and 

 third segments without a trace of discal bristles, bearing a distinct 

 median stripe of black, narrower on the third ; the hair of the sec- 

 ond and third segments, when viewed in profile, is depressed; first 

 abdominal segment with a distinct pair of median marginals. Geni- 

 talia black, rather small, the united inner forceps gradually nar- 

 rowed into a sharp beak which is a very little curved ; these forceps 

 form a somewhat boat-like structure, convex below, bofh transversely 

 and longitudinally and bearing numerous small, erect, brown hairs. 

 Legs black; the fi'ont femora cinereous on the outer side; all the 

 tarsi shorter thaji their tibiae (front tibia and tarsus in the pro- 

 portion of 46 to 36, measuring to the base of the claws) ; front 

 pul villi longer than the last joint of the tarsus. Wings hyaline, 

 rather narrow; fourth vein with a distinct fold at the bend; third 

 vein with four or five hairs at base. 



Length 11.2 mm. 



Described from one male, Mayaguez, Porto Eico, June 20, 1914, 

 R. H. Zwalenburg, collector. 



Type.— Male, Cat. No. 26783, U. S. N. M. 



PHOROCERA TACHINOMOIDES Townsend. 



Euphorocera tachinomoides Townsend, Trans. Amer. Ent. Soc, vol. 19, 



1892, p. 112. 

 Tricholyga, species, and Euphorocera, species, Townsend, Annals Ent. 



Soc. Amer., vol. 4, 1911, pp. 131 and 328 (internal organs). 

 Euphorocera peruviana and minor Townsend, Proc. Ent. Soc. Wash., vol. 



33. 1911, p. 53, without description; Proc. U. S. Nat. Mus., vol. 43, 1912, 



p. 803. 



Male. — (paratype of peruviana.) Front 0.26 of head width (two 

 .specimens, 0.25 and 0.27) pollen light yellow, still paler and ap- 

 proximating silver on the parafacials; orbitals distinct, the frontal 

 rows of bristles meeting the stout bristles of the facial ridges; first 

 two joints of antennae reddish brown, the third black ; palpi yellow, 

 slender; bucca one-fifth the eye height. Thorax densely gray polli- 

 nose; when viewed from behind there are four darker stripes, the 

 inner ones stopping far before the scutellum; pleurae heavily polli- 

 nose, with a small pteropleural bristle; usually three sternopleurals, 

 but sometimes two; four posterior dorsocentrals ; just in front of the 

 middle coxae at the median line are two continuous tufts of very 

 striking long bristles which lie very close together and are curved 

 backward. Abdomen strikingly elongate with reddish sides; the 



