Dec, 19I3-] MeLANDER: SyNOPSIS OF DiPTERA. 291 



A single specimen, taken July 31, 1908, on Mount Constitution, Orcas 

 Island, Washington. 



SCUTOPS Coquillett. 



Yellow, apices of palpi, two broad vittae on mesonotum, metanotum except 

 sides, abdomen and two interrupted bands on each tibia, black ; pol- 

 ished, the face, orbits and notopleural suture pruinose ; wings brown- 

 ish outwardly, with a subapical fascia and the tip whitish. 3 mm. 

 (Nicaragua.) (Proc. Ent. Soc. Wash., VI, 97, 1904.) 



fascipennis Coquillett. 



CYAMOPS new genus. 



Near Sciifops Coquillett. Head broader than the thorax, the upper 

 occiput concave, the lower occiput convex, the head therefore longest 

 beloAv, but still much higher than long. Eyes reniform, vertical, the 

 lower anterior facets enlarged so as to diminish the size of the face. 

 Sides of front nearly parallel, that part of the front between the ocelli 

 and the antennae nearly twice as broad as long; two pairs of fronto- 

 orbitals, on nearly a horizontal row, the inner pair reclinate, the outer 

 pair proclinate; no ocellar or postvertical bristles; but one pair (the 

 inner) of vertical bristles present. Face suddenly narrowed beneath 

 the antennae by the encroaching eyes, which nearly obliterate the 

 facial orbits at the place where they pass into the gense, the sides of 

 the center of the face, however, vertically subparallel, this portion of 

 the face slightly convex, expanding and rounding below without an 

 oral margin into the large buccal cavity; clypeus (Chitinhufeisen) 

 strongly developed, but retracted into the cavity. Cheeks about one 

 tenth the eye-height, the genae nearly parallel with the margin of the 

 eye, the buccae differentiated only as the line bearing the weak oral 

 hairs, the lateral prolongations of the center of the face forming a 

 triangular anterior part of the cheeks, passing into, but separated by 

 a distinct oblique suture, from the unusually developed shining pos- 

 terior oral margin ; vibrissae no larger than the oral hairs, but porrect. 



Chaetotaxy of the thorax as follows: one dorsocentral, two rows 

 of fine acrostichals approximate before but diverging behind, two noto- 

 pleurals, two supra-alars, four scutellars; one sternopleural centrally 

 located, pleurae otherwise glabrous. Abdomen very sparsely hairy, 

 comprising six flattened segments, broad up to the last segment, which 

 is very short and abruptly and strongly constricted for the attachment 

 of the small genitalia. The hypopygium consisting of two vertically 

 moving valves, from the upper of which arise two short converging 



