16 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 64 



gium small, valves rounded, wider than long. Front coxae whitish, 

 posterior ones yellow, extremities of femora yellow, tibiae brown, 

 front ones darkest, front metatarsi blackish. Wings yellowish, apical 

 third brownish, a slight clouding about posterior crossvein, second 

 and third veins nearly parallel, third and fourth veins centrally 

 divergent and apically slightly convergent; costal ratio 6:1.3:1, 

 sections of fourth vein 2.5:1:6, of fifth vein 1:1; halteres whitish. 

 Length 4 mm. 



Distribution. — Europe and North America. Specimens of both 

 extremes examined from Germany. There are no North American 

 specimens before us like the form ohscurior, but the paler form is 

 represented from Potlatch and Everett, Wash., and Priest Lake, 

 Idaho (Melander). The paler form is typical, and in Europe inter- 

 grades with the darker according to Czerny. The type of aTbimana 

 is supposed to be destroyed. 



18. CLUSIODES AMERICANA Malloch. 



Clusiodes americana Malloch, Occ. Papers Bost. Soc. N. Hist., vol. 5, p. 48 (1922). 



Male. — In the aTbimana group with three strong dorsocentrals. 

 Head yellow, the upper occiput brown, antennae yellow, palpi brown, 

 arista short, twice the antennal length, evidently pubescent, two 

 fronto-orbitals, the cruciate bristles inserted in advance of the pos- 

 terior pair, vibrissa small and curved, three fine buccal hairs, bristles 

 of head and thorax brown. Thorax reddish yellow, darker along 

 sides of notum and along upper half of pleurae. Abdomen black, 

 hj^popygium fairly large, the black valves as in Collin's figure of 

 gentilis, about twice as long as wide, linely hairy, the blunt apical 

 portion half the width of the base. Legs yellow, the front metatarsi 

 alone black. Wings largely smoky, a central hyaline crossband, 

 first posterior cell widest at middle, sections of costa about 3:1: 0.5, of 

 fourth vein 2:1:6, apical section of fifth vein a little shorter than the 

 basal; halteres white. Length 3 mm. 



Female. — Apex of antennae dusky; front tarsi brown. 



Recorded from Maine, New Hampshire, Vermont, and Maryland. 

 Specimens before us from Mount Washington, N. H. (Mrs. Slosson), 

 labeled by Coquillett as Eeteroneura, new species, Jeannette, Pa. 

 (Henry Klages), and several from Dead Run, Va. (Shannon), col- 

 lected with C. johnsoni. A large female taken by Shannon in May 

 at Ithaca, N. Y., is darker, the sides of the thorax almost blackish 

 above the lower pleurae, the dark part of the wings fuliginous and 

 the posterior legs luteous beyond the base. It is quite possible that 

 this species is only a mutation of C. johnsoni, as it differs merely 

 in the presence of small postverticals. If this should prove to be 

 the case the subgenus Columbiella becomes untenable, a conclusion 

 reached by the writers before the appearance of Malloch's last paper. 



