724 ASILID.E 



long ; coxae dull anteriorly and outside but brilliantly shining and bare beneath • 

 femora usually (but not always) only pubescent except for some antero-dorsal bristles 

 on the hind pair, but the tibiae and tarsi with bristles and pubescence. Front 

 coxae with moderately long soft thin pubescence anteriorly ; posterior coxae with 

 similar but less pubescence on the outer part and with some longer thin bristly 

 hairs in front about the tip ; trochanters shining and bearing only slight pubescence; 

 front femora with abundant long pubescence all over the hind part even to almost 

 the upper and under sides, but antero-dorsally and anteriorly with short dense 

 inconspicuous depressed pubescence ; middle femora with similar clothing but with 

 the long pubescence more restricted towards the underside ; hind femora with a row 

 of about seven anterior or antero-dorsal bristles and some smaller subapical ones ; 

 front tibise bristly and pubescent, with the usual long postero-ventral bristly hairs 

 and the usual few extra long thin hairs beneath, and with a terminal circlet of about 

 eight bristles ; middle tibiae with three rows of (2-4) long bristles besides long 

 pubescence, and with a terminal circlet ; hind tibiae with a few dorsal, antero-dorsal, 

 and antero-ventral bristles, but otherwise with only the terminal circlet and a 

 ciliation of pubescence on the basal half posteriorly ; all tarsi with a circlet of four 

 long strong bristles at the tip of each of the four basal joints and without any 

 conspicuous anterior or posterior bristle near the base of any basal joint, but the 

 last joint with a pair of long thin divei'gent bristles as long as the joint which 

 extend across the claws and with a single long thin bristle above the bristle-like 

 empodium besides other weaker lateral bristly hairs. All these bristles and 

 pubescence are in addition to the dense short depressed bristly clothing which 

 occurs all over the legs, and many of the generic characters now given may be of 

 only specific value. Pulvilli long and narrow ; empodium only a rather long thin 

 bristle ; claws long, not much curved until near the tip. 



Wings shorter than the abdomen ; cubital fork distinctly bell-mouthed ; posterior 

 cells all widely open, and the first one not at all contracted towards the wingmargin • 

 third posterior cell more widely open than the second or fourth because the third, 

 veinlet from the discal cell slopes downwards ; discal cross-vein before the middle of 

 the discal cell ; anal cell closed close to the wingmargin ; wing-membrane minutely 

 pubescent, uneven but not ribbed or wrinkled. Alar squamae small and narrow 

 with a rather thick margin and a rather short fairly equal fringe ; thoracal squamiB 

 absent. 



This genus is easily distinguished from the other British genera of 

 DasypogonincB by the general bristliuess of its thorax and scutellum (as 

 compared with pubescence only in Isopogon and very sparse bristles in 

 Dioctria) ; furthermore it is distinguished from Isopogon by the absence of 

 any curved terminal thorn on the front tibiae and by the less humped 

 thorax. From the other European genera it may be distinguished by the 

 obvious facial knob with its large projecting beard, the much widened 

 frons on the upper part, and the peculiar genitalia of the male which 

 resemble those of the Asilmce ; many minor characters are of value, such 

 as the higher head, the less bulging eyes, the rather cylindrical abdomen 

 with its conspicuous light grey bands, and the closed anal cell. The only 

 allied European genus with a prominent facial knob is Gyrtopogon. 



Zasiopogon is composed of only a few very closely allied species which 

 occur all over Europe and in North America. The metamorphoses are 

 unknown, but the perfect insects sit on stones, dry paths, tree trunks, or 

 similar substances, and although attempts have been made to distinguish 

 mountain species from those of the plains I have received our British 

 Z. ductus from most varied localities. 



Synonymy. — Loew in 1874 proposed the name Daulojoogon for this genus on the 

 ground that Ladopogon had been preoccupied, but that generic name had not 

 been used in Zoology. 



1. L. cinctus Fabricius. Abdomen blackish, with light grey bands; 



