14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



profile; occipital orbits very narrow. Vertex in holotype 0.27 head 

 width, narrowing gradually to 0.18 head width at callus, then widening 

 onto face; frons above callus subshining, somewhat rugulose, an 

 elongated triangular, elongated sublateral area on each side toward 

 callus shining; punctures and pile sparse; lower part of frons and face, 

 particularly facialia, densely white tomentose; a rounded, depressed 

 area above antennal bases, however, polished. Antennal flagellum 

 of moderate size, 1.5 as high as long, transverse basally on inner side; 

 flagellum brownish black on apical half, on inner side toward apex 

 with a polished semilunar callus similar to that of Neopachygaster 

 species but not so prominent; arista brownish, antenna otherwise 

 yellow. Proboscis brownish black with concolorous hairs. 



Mesonotum with brassy yellow hairs as in P. marginata but rel- 

 atively dense and more conspicuous, especially before the scutellum; 

 laterally before the suture these become yellow and are arranged 

 longitudinally in about four irregular rows; some black appressed 

 hairs on supra-alar prominences, anterior margin of mesonotum, 

 and apex of scutellum; disc of scutellum with hairs as on mesonotum 

 but not so conspicuous. Scutellum rounded, two-thirds as long as 

 wide, prominently margined but margin not flattened and subparallel 

 to discal part of scutellum and extending laterad a considerable 

 distance (fig. 19) ; margin with a row of microdenticles. Legs wholly 

 yellow. Wing essentially as in P. marginata but interruption of R 8 at 

 its base is not so prominent and R2+3 may arise either at or a little 

 before r-m. Abdomen as in P. marginata. Ovipositor yellow. Length 

 2 mm. 



Male. — Unknown. 



Distribution. — Dominica, Lesser Antilles. 



Holotype. — 9, Clarke Hall, Jan. 8-10, 1965, malaise trap, W. 

 W. Wirth, type no. 69520, USNM. 



Paratypes.— 2 99, same but Jan. 21-31 and Feb. 11-20. 



The two species of Psephiocera described above will trace to para- 

 graph 51 of Lindner's (1964) key to the Neotropical Pachygastrinae. 

 In the two species following this paragraph, Cyclotaspis inornata 

 Lindner and Myiocavia tomentosa Lindner, the height of the head in 

 proportion to its length is 1.75-2.00, much greater than in Psephi- 

 ocera, and the position of the antennal bases is much lower. If one 

 disregards the point of origin of R2+3, a character that is subject to 

 some variation in the Pachygastrinae, and chooses paragraph 54 

 instead of 35, both species trace to paragraph 88, but below that one 

 gets into difficulty. On the basis of the structure of the antennae and 

 scutellum, P. marginata woidd trace to Clarissa pallipes Lindner 

 but the white arista used as a supplementary key character contra- 

 dicts the arista coloration in P. marginata; comparison with a para- 



