2o2 OX THE MALE ITEXITALIA OF SOJtE ROBBER-FLIES. 



The branches of the upper forceps containing an apical process without an 

 appendix rubrithorax. 



3. The upper forceps atteruir-ted apically 4. 



The upper forceps not attenuated apically 6. 



4. The attenuated portion of each branch of the vipper forceps distinctly forms a 



process /eriHginehentris. 



The attenuated portion of the upper forceps forms a continuation of the basal 



portion and does not form a process 5. 



0. The upper forceps constricted subapically pelago. 



The upper forceps not constricted subapically but tapering more or less uni- 



foiTnly to the apex malleolus, inglorius a.nArufiveiUiis. 



5. The upper forceps ending in a minute projection and each branch of the upper 



and lower forceps containing three subapical bristles on the ventral side. 



hlasio. 

 The upper forceps more or less rounded and without bristles. 



iiiuriinis, sydiieyeiisis and alctias. 



AsiLUs GEXiTALis, n . sp . (Text-fig. 2.) 



Description. — 6. The head is covered with light yellowish tomontum; the 

 moustache of the same colour contains bristly hairs in the centre; the ))eard, the 

 bristles and hairs of the occiput are also the same colour; there are a few, red- 

 dish, short hairs on the tubercle containing the ocelli. The palpi are deep reddish- 

 .vellow, with similai-ly coloured hairs which, apically, are bristle-like. The an- 

 tennae are missing in the holotype and partly damaged in one paratvpe, but in 

 the second paratvpe they are reddish-yellow, with similarly coloured hairs on the 

 two basal .joints . The proboscis is also reddish-yellow but is strongly stained 

 ))lack on the apical half; the hairs are light yellowish. 



The thorax has a mixed yellowish and reddish-yellow ground colour, and con- 

 tains two black median stripes, and an interrupted lateral stripe on each side. 

 Dorsally, the bristles and liairs on the pronotum aio yellowish, and on the re- 

 mainder of the thorax black. The dorsal thoracic bristles consist of two pre- 

 sutural and one anterior to these, three superalar, four postalar and three or towv 

 dorsocentral. The scutellum is similar in gi'ound colour to that of the thorax 

 and contains four, black, marginal bristles, but in one of the jiaratypes there are 

 six reddish bristles on the apical margin. Yentrally the thorax is whitish with 

 very sparse whitish hairs. Tlie metapleural bristles are strong and yellow, and 

 the hy]>opleural bristles are weak and whitish. 



The abdomen, dorsally. is reddish-yellow with similarly coloured jiubescence 

 and whitish, bristly, lateral hairs. Yentrally, the abdomen is unicoloured Avith 

 the under side of the thorax. 



The genital organs are very large and the for<'eps are set v.ule apart ex- 

 ])osing other parts which are hidden in most species of tlie genus. The lower 

 half of each branch of the upper forceps is produced apically into a very long 

 jirocess which curves upwards, and, near the base of this, there is a shoif ajipendix 

 Avhieh branches towards the median line and is directed downwards. Tlie lower 

 forceps are short, and the apical prong can be seen diverted so that it ])oints to- 

 wards the base. The lamella is broad and short, and issues from a two-pronged 

 aiipendage, the apices of which can be seen l)etweeTi the process and the basal jKir- 

 tion of the upper forceps. 



The legs have their coxae whitish with yellow liairs and livistlcs. Tlie 

 inihilli arc yellow and (lie claws are reddish hasally ami l)hick .-iiiically; the 



