498 



ROBBER FLIES OF THE WORLD 



parts meet distally in the midplane. Proctiger mod- 

 erately protuberant. Eighth sternite as in Lochmor- 

 hynchns Engel quite long and protuberant, each lateral 

 terminal part with a basketlike fringe of close-set, long 

 bristles. Hypandrium, if present, is concealed. Fe- 

 male terminalia quite distinct from Lochmorhynchus. 

 Eighth segment greatly compressed laterally; ninth 

 cylindrical and bulbous, or even depressed and expand- 

 ing apically. The tenth segment is narrowed to the 

 same extent that the ninth segment is extended, so that 

 both segments in dorsal aspect are egg-shaped. 



Distribution: Country unknown: Lonchodogonus 

 crihratus, new species. There was no locality label on 

 these specimens. The nearest related genus is from 

 Chile. 



Lonchodogonus cribratus, new species 



Large, black to brownish black flies with reddish 

 brown pollen. 



Head : The head is brownish black with the bristles 

 and pile brownish white in color, except for a few, 

 black bristles or hairs on the dorsal surface of the first 

 2 antennal segments and on the ventral surface of the 

 second segment also. The ocellar tubercle has 6 long, 

 slender, black hairs. Bristles of occiput stout, short 

 and brownish yellow. 



Thorax : Both the pleuron and mesonotum are red- 

 dish sepia pollmose ; the latter is subvittate. 



Legs : The femora are brownish black but the tibiae 

 and tarsi are reddish brown; all tarsi bear very long, 

 brownish yellow, stout bristles. 



Abdomen : The abdomen is tapered and more or less 

 cylindroid. Sides of first tergite with abundant, stiff, 

 brownish yellow pile and a vertical row of 3 long, 

 stx)ut, reddish brown bristles; other segments without 

 specialized pile or bristles. 



Type. Male; allotype female. Believed to be from 

 the Cordilleran region of southern South America, in 

 which are all relatives of these flies. In the Zoologische 

 Staatssammlung, Munich, 



Genus Proctacanthella Bromley 



Figures 377, 378, 720, 1416, 1425, 2303, 2314, 2473, 2474 



Proctacanthella Bromley, Ann. Ent. Soc. America, vol. 27, p. 96, 

 1934. Type of genus: Asiltts cacopilogiis Hine, 1909, by 

 original designation. 



Small or mediimi slender flies with elongate, tapered 

 abdomen. They differ from Asilus Linne by having 

 the metanotal callosity bare. They resemble Procta- 

 canthus Macquart by having a circlet of spines at the 

 apex of the ovipositor, but differ in the venation; the 

 posterior branch of the third vem terminates beyond 

 the apex of the wing as it does in Asilus. Length 11 

 to 25 mm. 



Head, lateral aspect: The head is short, the occiput 

 only moderately developed, but very prominent below, 



because of a strong posteroventral recession of the eye 

 on its lower half. The face is short and nearly plane, 

 or with a very slight elevation in the middle. It is 

 chiefly conspicuous because of the anterior recession of 

 the eye. The occiput has dense, coarse, generally 

 opaque white pile on the ventral half and pale bristles 

 beginning at the middle of the head ; the upper elements 

 are quite stout. The proboscis extends well beyond the 

 face ; it is comparatively narrow with a low, dorsal keel 

 over the middle portion, the apex is more narrowed, 

 bluntly rounded and with fine pile ; the sides and base 

 below bear abundant, long, coarse pile extending to or 

 beyond the middle. Palpus slender and cylindrical and 

 pilose but with bristles limited to the apex. The an- 

 tenna is attached a little above the middle of the head 

 and of only moderate length. They are, with style in- 

 cluded, approximately as long as the head. First seg- 

 ment nearly twice as long as the second; third segment 

 long oval, with a distinct microsegment and a short, 

 thick bristle-tipped style, approximately as long as the 

 third segment. 



Head, anterior aspect: The head is about li/^ times 

 as wide as high, exclusive of cheeks; the cheeks are 

 moderately high and the face densely pubescent, with- 

 out pile on the upper fourth or third but with more or 

 less appressed, abimdant, coarse, moderately long, 

 bristly pile over the middle third of the face which in 

 some species is matted. On the lower third of the face 

 are numerous long, basally stout, whitish bristles which 

 extend down the upper half of the lateral margins of 

 the oblique subepistoma. Face below antenna about a 

 fourth the head width, with nearly parallel sides on the 

 upper half and slightly divergent below ; the front is 

 short, pollinose, sunken with transverse groove; it has 

 a subocular row of bristly pile and close beside it an 

 additional patch or triangular area of bristly pile. 

 Vertex sliglitly narrowed, slightly excavated, tliickly 

 pale pollinose with slanting sides and low ocellarium 

 which bears 2 to 6 pairs of bristles between the ocelli 

 and others behind. 



Thorax : The mesonotum is pollinose and pale with 

 rather abundant but unusually stubby, sharp, setate pile. 

 The pile is undifferentiated anteriorly but there are 5 

 pairs or fewer of conspicuous, postdorsocentral bristles 

 and sometimes others included between these pairs. The 

 lateral complement of stout bristles consists of 2 noto- 

 pleural, no supraalar, 1 postsupraalar, 1 suprapostalar, 

 2 postalar, and 3 or 4 pairs of scutellar marginal bris- 

 tles. There are also stout, submarginal bristles on the 

 posterior half of the very convex, not rimmed scutellum. 

 Pronotum with stout bristles, sometimes as few as 2 

 pairs. Upper border of the mesopleuron, its posterior 

 half, the upper fourth of the sternopleuron and a verti- 

 cal band on the posthypopleuron all with coarse, rather 

 long pile. Metapleuron with a vertical band of slender 

 bristles and long pile. Metanotal callosity micropubes- 

 cent only. Whole pleuron densely pale pollinose or 



