Arctophila. 557 



Ihe epistoma is brown or yellow, with the lower lateral parts black; 

 it is almost bare as there are hairs only on the sides at the eye- 

 margins, and in one species some hairs on the lower lateral parts. 

 Jowls small and narrow, separated from epistoma by a deep furrow 

 which separates off narrow eye-margins; these eye-margins bear short 

 hairs. Oral cone and proboscis rather long; clypeus long and with 

 a long basal part. The mouth parts characteristic by their long and 

 slender shape. Labrum (bombiformis) long, strongly semitubular, the 

 apical processes of eqiial length ; the median process cleft to the base, 

 each part conically pointed, cleft into spine-like emergences at the 

 apex; the upper lateral processes thin and delicate, curved a little 

 inwards and befid at the apex; the lower lateral processes with the 

 lower apical corner rounded, the upper or inner corner drawn a little 

 out and somewhat pointed; the usual lateral rows of small papillæ 

 on the inside present; hypopharynx as long as labrum, slender, with 

 parallel sides, it is attenuated at the end and somewhat pointed; the 

 maxillæ are long and slender, almost as long as hypopharynx ; they 

 are knife-shaped and a little curved towards the apex, and they are 

 somewhat pointed; they have the usual microscopical spines in rows; 

 the palpi are as long as or slightly longer than the laciniæ, thread- 

 like, with microscopical hairs and with numerous bristles in the whole 

 length. Labium long and slender, with the basal part a little longer 

 than the narrow and elongated labella. Thorax nearly quadrate; 

 scutellum black, with no distinct marginal fringe below. Metapleura 

 with dense, not quite short hairs. Abdomen somewhat ovate; in the 

 male there are four not transformed segments. Genitalia of medium 

 size or somewhat large, the hypopygium short but somewhat broad, 

 the incision with the outer lamellæ rather shallow; the claws or 

 clasping terminal appendages rather strong, unsymmetrical, the ap- 

 pendage on the right side long and claw-shaped, the other shorter 

 and of another shape; the penis or penis-sheat very thick. In the 

 female the abdomen has five visible segments, the rest hidden, the 

 last terminating with two lamellæ. Legs somewhat long ; hind femora 

 more or less thickened and curved in the male, slightly or not in the 

 female ; the hind tibiæ may also be somewhat thick and curved in the 

 male, and in this sex they are prolonged into a short, spur-like pro- 

 cess at the apex below. The legs are more or less long and densely 

 haired; the trochanters have a couple of long, bristly hairs above. 

 Claws and pulvilli well developed; empodium spine-shaped, hairy. 

 Wings with the cubital vein curved a little down over the first posterior 

 cell or only very slightly so (or, in American species, more strongly 

 dipped), medial cross-vein just before or a little behind the middle of 



