362 



UNITED STATES NATIONAL MUSEUM BULLETIN 22 4 



boides Loew (1851) ; consimiUs Wood (1874) ; fioccosa 

 Bezzi (1908) ; fulleborni Griinberg (1907) ; imitator 

 Griinberg (1907) ; madagascariensis Enderlein (1930) ; 

 marshalli Austen (1902) ; nigripennis Wiedemann 

 (1930) ; nigrita Griinberg (1907) ; pellitiventris Ender- 

 lein (1930) ; rufibarbis Fabiicius (1805). 



Oriental: Hyperechia /era Wulp (1872); xylocopi- 

 formis Walker (1849). 



Country unknown : Hyperechia robusta Wiedemann 

 (1828). 



Thorpe (1927), Lamborn (1927), and Engel (1929) . 

 present a lengthy study of the larva and pupa of 

 Hyperechia bifasciata and its relation to Xylocopa 

 bees. The larvae are associated with the wood of trees. 



This remarkable genus of conspicuous, bulky flies is 

 an important element in the South African asilid f auna. 

 Two species are known from Asia. 



Tribe Ctenotini 



Four genera of the subfamily Laphriinae are note- 

 worthy for their elongate, 1-segmented palpus and 

 their blunt claws. All four of these genera have a 

 characteristic row of strong bristles along the dorsal 



margin of the proboscis. I propose the tribe Ctenotini 

 for them. They are confined to the Palaearctic and 

 Ethiopian regions. 



KEY TO GENERA OF CTENOTINI 



1. Palpus of 1 segment; claws blunt 2 



Palpus of 2 segments ; claws normal ; remainder of sub- 

 family Laphriinae 



2. Middorsal margin of the elongate, laterally compressed pro- 



boscis with a conspicuous row of long, stout bristles . . 3 

 Middorsal margin of proboscis without long, conspicuous 

 bristles; a few, small setae or fine hairs may be present 

 Palpus composed of a single, elongate, clavate, bristly, 

 rather swollen segment. First posterior cell closed and 

 usually with a stalk 4 



3. Large or very large, elongate, bare flies with long ungainly 



legs Lamyra Loew 



Short, smaller, robust flies Stiphrolamyra Engel 



4. Third antennal segment elongate, arched and concave dor- 



sally ; proboscis compressed laterally, obtusely truncate 



at apex Pabactenota Engel 



Third antennal segment shorter, constricted subbasally, 

 dilated or swollen apically. Proboscis pointed apically. 



Ctenota Loew 



Genus Ctenota Loew 

 Figures 243, 623, 1198, 1207, 1597, 2086, 2090 



Ctenota Loew, Beschreibungen europSischen Dipteren, vol. 3, 

 p. 135, 1873. Type of genus : Ctenota molltrix Loew, 1873, 

 by nionotypy. 



Epilamyra Becker, in Becker and Stein, Ann. Mus. zool. Acad. 

 Imp. Sci. St. Petersbourg, vol. 17, p. 541, 1913. Type of 

 genus: Epilamyra coerulea Becker, 1913, by original 

 designation. 



Flies usually of medium size and always stout, dark 

 in color but with appressed, greyish or yellowish white 

 pile, which gives them a characteristic appearance. 

 Form robust and compact. They are readily distin- 

 guished by the very blunt claws, the dense, white mys- 

 tax, which slants rooflike downward over the whole 

 face, the slender, hyaline wings with narrow, closed, 

 first posterior cell. Other characters are the absence 

 of the alula and the frequent recession of the tips of the 

 medial veins. Length 13 to 27 mm. 



Head, lateral aspect: The face is short, nearly plane 

 or very slightly convex. The eye is of medium length. 

 Occiput only moderately developed but extending in 

 uniform thickness nearly to the eye margin, from 

 which point it slopes abruptly outward. The eye ex- 



tends far beyond the occipital margin. Pile of occiput 

 dense, coarse and long, and like all other pile whitish. 

 It continues abundant on the upper portion of the occi- 

 put though a little shorter; weak bristles are present 

 only on the upper third of the head. There are 5 

 pairs near the vertex and behind the vertex a patch of 

 7 or 8 bristles. Proboscis short and unusually stout 

 and robust, to and including the apex. The base is 

 strongly expanded from the dorsal aspect, the whole 

 distinctly compressed laterally towards the apex. The 

 apex has numerous, rather long, stiff, bristly hairs; 

 these are confined to the immediate lateral apex and 

 extend ventrally over approximately the apical sixth; 

 base below with numerous, rather short, fine hairs con- 

 tinued ventrolaterally. Near the base is a well devel- 

 oped medial ridge disappearing beyond the middle. 

 Near the dorsal margin on the outer third is a row 

 containing as few as 4 or as many as 25 stiff, bristly 

 oblique hairs. Proboscis directed horizontally for- 

 ward, of moderate length and distinctly longer than 

 the face. Palpus unusually large, robust and cylindri- 

 cal, densely beset ventrally, dorsally and at the apex 

 with rather long, pale bristles and with lateral bristles 

 only basally. I can find evidence of only one segment; 

 the remains of the first segment seem to be completely 

 fused with the base of the proboscis, and behind the 



