66 H. C. EFFLATOUN. 



DIAGNOSIS: — Length of abdomen more than twice its 

 breadth; abdominal bands very emarginate, or separated into trian- 

 gular spots which never reach the side margins. 



DESCRIPTION:— Male. "Face and irons covered with dull 

 "yellow dust, which leaves the central knob shining and usually 

 "darkened from orange up to blackish, and downwards from this 

 "the face is often darkened to the mouth and the lowest part; the 

 "front of the frons just above the antennae is also shining, being 

 "luteous between and immediately above the antennae, and blackish 

 "above that; the pubescence of the frons is all black and is also 

 "inconspicuously so down the sides of the face, but pale yellow on 

 "the lower part of the face, on the jowls and on the back of the 

 "head; on the upper part of the back of the head there are some 

 "longer black hairs overhanging the eyes ; vertex shining black 

 "and black haired. Antennae reddish orange with the third joint 

 "black except for a large reddish-orange spot beneath its base ; 

 "arista brown and bare. 



"Thorax very shining aeneous black, humeri and pleura 1 dull; 

 "pubescence pale brownish to yellow. Scutellum aeneous yellow with 

 "longer black pubescence. 



"Abdomen rather dull black but shining at the tip, narrower 

 "that the thorax and with parallel sides; the second segment with 

 "a pair of fairly large triangular spots running up from near tin- 

 "latere side-margins towards the middle of the disc and growing 

 "broader as they ascend, but leaving about the middle sixth of the 

 "segment black; the third segment with a pair of spots (or a band 

 "near the front margin) which do not touch the front or the side- 

 "margins, but are really a pair of large orange spots which are 

 "wider at the sides than at the middle and which are almost ex- 

 pended to the side-margins at their lowest side edge, and sloping 

 "upwards, thence on their lower margin leave just the middle of 

 "the segment all black ( = var maculicornis), or with the spots 

 "united on their upper part; the fourth segment has fairly similar 

 "spots and its hind margin is all orange and united with very 

 "large orange spots at the basal corners of the fifth segment, 

 "which leaves only the triangular middle half of that segment 

 "black. The abdomen is often less orange, especially on the fourth 

 "and fifth segments. Pubescence pale yellow and long about the 

 "base at the basal portion, but all black after the yellow spots on 

 "the third segment, except for a few yellow hairs at the sides 

 "about the base, or on the yellow spots, of the fourth segment. 

 "Genitalia moderate, mostly orange. Legs varying remarkably from 

 "simply all pale brownish-yellow with indications of darker color- 

 ing on the third femora, to the hind legs being not uncommonly 



