ROBBER FLIES OF THE WORLD 



575 



over the middle ; it has a narrow, inconspicuous, grey- 

 ish white, medial stripe, a somewhat moi-e conspicuous 

 greyish white stripe from the level of the humerus to 

 the scutellum and the whole scutellar area in an oblique 

 light is also greyish white. Lateral margins above the 

 postalar callosity are greyish white but above the wing, 

 mesopleuron and medial to the humerus the pollen is 

 pale, brownish yellow. Pleuron densely brownish yel- 

 low, with minute pubescence or rather pollen. All of 

 the pleuron, except the posterior border of the meso- 

 pleuron and its anterior border and narrow, dorsal 

 margin are more or less shining and bai-e. Pile and 

 bristles of the mesonotum are black, of the pleuron yel- 

 low, except that the entire pronotal pile and bristles 

 are black. There are 2 black hairs among the yellow 

 pile on the pteropleuron and 3 black bristles on the 

 metapleuron among the yellow bristles. Metanotal bris- 

 tles and pile black. 



Legs : The legs are everywhere quite black. The bris- 

 tles of all of the tibiae and tarsi black and bristles of 

 all of the femora black with the exception that the 

 medial and ventrolateral bristles on the basal half on 

 the hind femur are reddish yellow ; on the distal half of 

 the hind femur these surfaces have black bristles. Also 

 on the ventral surface of the anterior and middle fe- 

 mora the bristles are yellow. Dorsal pile of the middle 

 and hind femora very fine, appressed and yellow on the 

 basal half ; the dense setae brush of the anterior tibia 

 which extends only into the basitarsal segment is red- 

 dish brown; this brush of setae is present also on the 

 hind tibia, its basitarsus, and its second tarsal seg- 

 ment. 



Wings : The wings are dilutely brownish hyaline on 

 all the basal, discal and the fourth posterior cells and 

 also on the base of the remaining marginal cells. There 

 are dark, reddish villi over nearly the whole of the 

 marginal cell, anterior half of the submarginal cell, 

 whole outer part of the submarginal cell, and nearly 

 the whole of the second submarginal and first 3 pos- 

 terior cells. 



Abdomen : The abdomen is black, with greyish white 

 pollen on the first two tergites. The posterior margins 

 of the second to the seventh tergites have rather wide 

 pollinose margins, which are rather sharply distinct; 

 this pollen is golden brown and extends conspicuously 

 along the whole lateral portion of the fourth, fifth and 

 sixth tergites, where it is rather bright; the pollen is 

 rather paler on the sides of the third tergite and pos- 

 teriorly on the second tergite. Stemites with similar 

 pollen ; pile of the abdomen reddish yellow, but chiefly 

 black on the hypopygium on which it is yellow only 

 terminally. Pile of the stemites reddish yellow. 



Female. Similar to the male in all respects as far 

 as color is concerned. 



Type. Male, allotype female, from east side of the 

 edge of the forest of the Aberdare Mts., Kenya, 7,300 

 ft., February 24, 1911. In the collections of the 

 Zoologische Staatssammlung, Mimich. 



Cratopoda, new genus 

 FiouBEB 396, 737, 1527, 1536, 2227, 2430, 2454 



Type of genus : Asilus gayi Macquart, 1838. 



Medium size flies with numerous, prominent bristles 

 down the middle of the mesonotum and the entire mid- 

 dle of the prominent face. Anterior and middle fe- 

 mora with 2 rows of stout bristles. Superior forceps 

 with a deep cleft. Kelated to Threnia Schiner. Length 

 17 mm. 



Head, lateral aspect: The face is plane for a short 

 distance immediately below the antenna; the lower 

 five-sixtlis of the face is prominent and strongly pro- 

 tuberant and gently convex. Eyes slightly recessive 

 anteroventrally, oval anteriorly and nearly straight on 

 the posterior profile across the middle. The occiput 

 is unusually prominent, especially on the upper portion 

 and continues upward to the vertex, the occipital pile 

 is everywhere fine, long and crinkled but is scanty across 

 the middle ; it is very abundant dorsomedially and sim- 

 ilarly abundant below on the lower fourth. Bristles 

 begin below the middle and are quite stout; there are 

 9 to 12 pale elements below and near the vertex 2 to 4 

 blackish bristles; these upper elements are somewhat 

 anteriorly curved. The proboscis is of moderate length, 

 subcylindrical, and slightly swollen above the base; it 

 has a bluntly rounded apex, bearing fine pile; the basal 

 half of the sides and ventral portion bear numerous, 

 long, fine haii-s. Palpus of one segment with long, 

 stout, apical bristles and stiff, ventral pile. The an- 

 tenna is attached to the upper third of the head; the 

 second segment is two-thirds as long as the first, the 

 third segment, style excluded, is as long as the first two 

 combined. The third segment is attenuate below on 

 the outer third and bears a short, distinct microsegment, 

 followed by a relatively short, stout, style. The style 

 is three-fourths as long as the third segment and bears 

 a minute spine apically. The first segment has 6 to 8 

 long, stiff, black hairs ventrally, some long pile laterally 

 and bears on the apical half below 2 very long, very 

 stout, black bristles which are longer than the first two 

 segments of the antenna combined; second segment 

 with only a few, short setae above and below. 



Head, anterior aspect: The head is only a little wider 

 than high ; the face below the antenna is about a fourth 

 the head width and divergent below. Subepistomal 

 area rather small and narrow and concave, filled by the 

 palpus; its sides bear stout bristles. The face cover 

 is pubescence without pile, but with a wide band 

 of bristles throughout the middle of the entire pro- 

 tuberance and which begin just below the antenna; 

 these bristles are long, anteriorly directed, curved, 

 slender, and black; near the middle of the face these 

 give way medially to stouter, long, pale bristles. The 

 lower, anterior, epistomal margin bears a cluster of 

 similar, stout, pale bristles wliich are continued on 

 down the lateral margins as an irregular row, with 

 slender black bristles intermixed. The front is slightly 

 divergent above, the vertex slightly convergent. The 



