N0 - 3622 STRATIOMYIDAE — JAMES 17 



part of M separating basal cells reduced to a fold. R 2+3 arising at r-m. 

 Microtrichia generally distributed except at extreme wing base, 

 including largest part of anal cell; alula broadening somewhat toward 

 apex, where it is rounded, completely beset with microtrichia. Halter 

 with yellow stalk and white knob. 



Abdomen largely black haired, some whitish erect pile mixed with 

 black at sides of basal two segments; terga 3 and 4 each with a side 

 spot of appressed whitish hairs, small on 3 but large on 4; a median 

 vitta of whitish hairs running from middle of third tergum to apex 

 of abdomen. Sternum wholly with inconspicuous black hairs. Geni- 

 talia small; aedeagus (fig. 5) trifid, the intromittent organ and guards 

 similar in form, digitate and rounded apically; dististyli rather robust, 

 oval. Length 3.0-3.5 mm. 



Female. — Frons distinctly broader than ocellar triangle, at 

 narrowest 0.19-0.20 head width, median polished area proportion- 

 ately narrower and sides of frons not so densely tomentose. Occipital 

 orbits very narrowly developed on upper half and not tomentose, 

 on lower half slightly broader than in male. Dorsal hairs of meso- 

 notum more brassy; black hairs more extensive, the pah- of triangles 

 extending to form a presutural vitta confluent with the postsutural 

 spots as well as with a pair of presutural spots, thus tending to isolate 

 the median area into a presutural vitta of yellow hairs. 



Distribution. — Dominica, Lesser Antilles. 



Holotype— c?, Clarke Hall, Jan. 21-31, 1965, malaise trap, W. W. 

 Wirth, type no. 69522, USNM. 



Allotype. — 9, same. 



Paratypes. — 1 d\ 18 99, same but Jan. 11 to Mar. 31; 1 9, 

 Hillsborough Estate, Mar. 13, 1965, H. E. Evans. 



This species is apparently very close to D. lopesi Lindner. There 

 are a number of small differences: the head proportions, the meso- 

 notal pattern, the darkened anterior tarsus. Dactylodeictes amazonicus 

 Kertesz, the type of the genus, is easily differentiated by the elevated 

 ocellar triangle, and D. insularis James, from the Galapagos, by the 

 lack of differentiated lateral hairs on the mesonotum, the longer and 

 more erect digitate process of the scutellum, and the lack of a differ- 

 entiated vitta of hairs on the abdomen. Lindner and Kertesz make 

 no mention of the differentiated lateral, presutural hairs. What I 

 take to be D. lopesi Lindner, based on a male from the Canal Zone 

 and two females from Trinidad, has the mesonotal pile much coarser, 

 covering the mesonotum except for a pair of spots on the postsutural 

 prominences and a pair of inward extensions from the anterior margin, 

 and without lateral differentiation of hairs; this agrees with Lindner's 

 description. 



