BY FREDERICK A. A. SKUSE. 90^ 



Head greyish-brown ; rostrum palpi, and antennae brown or 

 blackish, the two basal joints of latter sometimes ochreous ; first 

 flagellar joint somewhat elongate, the rest globose to elliptical ; 

 extremely short verticils. Collare ochreous, tinged with brown. 

 Thorax ochreous, dull, with three broad black stripes ; interme- 

 diate stripe reaching suture ; posterior portion of thorax, with 

 scutellum and metanotum, with a greyish bloom, usually somewhat 

 infuscated with brownish ; pleurae somewhat tinged with brown, 

 and having a greyish bloom. Hal teres ochreous, the club infus- 

 cated. Abdomen dusky dull brown, sparingly sprinkled with 

 yellowish pubescence, sometimes the margins of segments tinged 

 with reddish-ochreous ; venter also more or less tinged with same ; 

 genitalia ochreous or reddish-ochreous ; ^ forceps apparently some- 

 thing like those of A. inconstans (Mon. Dipt. N. Amer. PI. iv. 

 fig. 30), but there is a distinct anal style, and the pair of 

 small horny appendages (h) seem to be wanting; 9 ovipositor 

 rather short, somewhat curved, the upper and lower valves 

 about equal in length. Coxae, femora and tibiae fulvous ; the 

 latter two with a black ring at the apex, the tibiae also slightly 

 infuscated, sometimes entirely brownish ; tarsi black. Wings 

 slightly tinted with yellowish or pale brownish, fulvous at the 

 the base ; pale greyish clouds (sometimes scarcely perceptible) at 

 origin of praefurca, bases of sub-marginal cells and on the cross- 

 veins j stigma elongate, pale brownish ; veins brown or blackish, 

 the auxiliary vein somewhat fulvous. Auxiliary vein reaching 

 costa opposite the tip of fifth longitudinal vein ; sub-costal cross- 

 vein situated before origin of praefurca a distance equal to more 

 than twice the length of great cross- vein ; marginal cross-vein its 

 length distant from tip of first longitudinal vein ; praefurca short, 

 originating considerably beyond the middle of the wing, more or 

 less arcuated, usually a little more than half the length of anterior 

 branch of second longitudinal ; second sub-marginal cell a little 

 shorter than the first (in one instance both of equal length, their 

 inner ends and small cross- vein meeting at one point) ; small 

 cross-vein joining petiole of secDud sub-marginal cell at varying 

 points ; discal cell elongate, as long or longer than third basal 



