12. LASIOPOGON 725 



genital claspers of the male long, with a blunt end which is rounded at 

 its lower angle. 



A rather small dark-colored Asilid with greyish white 

 bands on the hindmargins of the abdominal segments, and 

 with the thoracic bristles more abundant than in any other 

 British species of the Da^yjiogonince. 



$ . Face and f rons dusted brownish ; face with a yellowisb brown shimmer ; 

 facial knob large and wide, with the face-beard extending all over it so that 

 only just the upper part and the sides of the face are left bare ; face-beard 

 black with occasionally a few rusty or greyish yellow hairs intermixed on 

 the lower part, and the hairs nearly all equal in length and density and 

 standing out so stiffly that they only slightly droop ; chin- and jowl -beards 

 dense, long, and silky whitish, while similar pubescence extends up the lower 

 half of the back of the head ; this lower half of the back of the head is gi'eyish 

 white and is rather wide because the eyes are somewhat narrowed thereabouts, 

 but the upper half is more light brownish grey and bears an abundant 

 irregular (three or four bristles wide) festoon of black bristles, which at 

 their tips are strongly curved forwards over the eyes and which extend round 

 the upper eye-angles on to the broad upper part of the orbits until level with 

 the upper ocelli ; frons widening rapidly upwards from the antennte (because 

 of the widening of the orbits) until it becomes about twice as wide at the 

 vertex as at the antennae, and the orbits bearing numerous moderately long 

 black hairs (sloping forwards), while the two raised parts between the three 

 channels bear numerous similar hairs (but bent rather backwards), and the 

 moderately elevated ocellar knob bears about ten rather longer outstanding 

 black hairs ; the middle postvertical channel down the back of the head is 

 bare, but a few black bristly hairs occur on the upper part of the actual back 

 of the head; collar pale greyish brown, bearing short but not sparse 

 pubescence on the upper part and longer thin pale pubescence on the sides 

 and lower part. Proboscis shining black, sloping, with the usual very slight 

 pubescence about the tip and long pale pubescence beneath on the basal half ; 

 palpi thin, rigid, short (being hardly one-third the length of the proboscis), 

 black, and almost bare except for two or three comparatively long porrect 

 pale hairs near (but not at) the tip. Antennae entirely greyish black ; two 

 basal joints short, but the second joint shorter and stouter than the basal one, 

 while both joints bear porrected black bristles (rather more obvious on the 

 underside) ; third joint strap-shaped, slightly longer than the two basal joints 

 together ; style bare, rather thick, about one-third the length of the third 

 joint, and bearing a tiny apical bristle. 



Thorax ranging in colour from yellowish brown to dark grey, not at all 

 shining, and with the raised extreme back point of the humeri chestnut ; 

 sometimes with a rather narrow blackish middle line and two blackish side 

 stripes (not nearly reaching to the front but bending outwards at their front 

 ends towards the humeri) ; the side stripes may or may not be interrupted at 

 the suture, and extend to the hindmargin, while the middle line may only 

 reach to the suture, and there are indications of dark stripes still more towards 

 the sides just before and just after the suture ; or the thorax may have two 

 closely approximated dark brown stripes which do not extend to the hind- 

 margin and a pair of fainter side stripes which become broader on their front 

 part (which is not near the front of the disc) and curve towards the humeri ; 

 or the thorax may appear to be blackish brown Avith two pale greyish brown 

 stripes which are rather wide apart but converge after the suture so that they 

 form one broad grey middle stripe, and then (taking the dark colour as the 

 ground colour) the other side stripes can be traced. Pubescence (as distinct 

 from long bristles) composed of numerous small black bristles on most parts 

 (including the humeral knobs) but not on the front part of the stripes on each 

 side of the middle line nor on the broad dark outer side stripes except on 

 their front part and near the humeri. Bristles consisting of usually two 



