PROC. ENT. SOC. WASH., VOL. 41, NO. 8, NOV., 1939 239 black with two pale yellow spots above antennal bases. Antennae pale with three basal joints shining, remainder covered with short fine hairs, the tip of the last joint darkened, 3d and 4th joints subequal and long, 5th to 9th gradually wider and short. Prothorax about twice as wide as long at base, thence gradu-ally narrowing to a rounded front that entirely conceals head, sinuate on the basal margin; a wide reddish hyaline margin, and a shining black, somewhat convex disc, with pale yellow spots, two anterior, three lateral, and five median; surface shining, with very fine scattered punctures, a deeply indented one on either side of middle in four of the five specimens. Scutellum tiny, rounded triangular, shining black. Elytra rounded convex, wider at the base than prothorax with wide margin with a reddish edge; humeri prominent, a thickening running into the margin from the humerus and also at the middle of the elytra; surface shining black with large irregularly shaped blotches of yellow; deep coarse but not dense punctures from the suture to the middle, these more or less striate but on the sides becoming denser and confused. Body beneath shining black with the apex of the femora, tibiae, and tarsi reddish; claws simple and widely divergent. Length 8 to 10.4 mm. Width 7.5 to 8 mm. Type.— Male, and 2 paratypes, M. C. Z. Cat. No. 23637. 2 paratypes, U. S. Nat. Mus. Cat. No. 53283. Type locality. — Constanza to Jarabacoa and Constanza, 2-4000 ft., Dom. Rep., collected in August, 1938, by P. J. Darlington. Remarks. — This is the second species of the genus to be described. The other, A. flavicornis Oliv., described from Guiana, is very similar in size and coloring but the elytra are more closely punctate and do not have such large pale blotches. The aedeagus also differs in being less acutely tipped than in A . darlingtoni. When specimens were soaked in water, some of the original living colors returned and the yellow elytral spots became golden with green and blue iridescence. TWO NEW SPECIES OF TACHINIDAE PARASITIC UPON HEM-LOCK SAWFLY LARVAE IN NORTH AMERICA (DIPTERA : TACHINIDAE). By David G. Hall, Bureau of Entomology and Plant Quarantine, U. S. Department of Agriculture. In the course of studies of the hemlock sawfly, Neodiprion tsugae Middleton, by field workers of the Bureau of Entomology and Plant Quarantine, two new species of Tachinidae, one representing an undescribed genus, have been reared in numbers as parasites of the sawfly larvae. These are described at this time to make names available for use in economic and biological papers.