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TWO REMARKABLE NEW SPECIES OF DIPTERA. 



BY ERNEST E. AUSTEN, F.Z.S. 



THE two sj)ecies described below are of interest not onlj' on account of their verj' 

 large size, but also becanse the}' appear to be mimics of particular sjiecies of 

 Hymeuo[itera. According to the collector, the flies are met with in the same places 

 and at the same time as the Hymenopteron mentioned in each case, from wliich they 

 are very difficult to distinguish when on the wing or in the net. The types of botii 

 species are in the Tring Museum, and I have to thank the Hon. Walter Rothschild 

 for permitting me to describe them. 



PANTUPHTHALMIDAE. 



nilAl'IirOliHYNCHUS Wicd. 



1. Rhaphiorhynchus rothschildi sp. nov. 



cJ.- — Length ('-l specimens) 30 to 41'5 mm.; width of head 9 mm.; width 

 of thora.K at base of wings 9 mm. ; greatest width of abdomen (second segment) 

 lU'o mm. ; length of wing 37 to 3S-0 mm. 



2i arrow-bodied, elongate species, with suhiduti' untentiae in tlie i ; head, bod//, 

 and legs deep black, dorsum of thorax tinged with mummy-brown,* with black lonqi- 

 tadinal stripes ; humeral colli dark brown, with a bujf-coloured streak on upper side, 

 or a bujf'-coloured spot above, close to apex ; dorsum of abdomen with an elongate 

 shining median spot or longitudinal streak on each segment; icings dark brown, 

 extreme base black, veins (including costa) , costal cells, proximal third or rather more 

 of marginal cell, first basal cell except lower and distal borders, and an irregular 

 area sometimes extending from near base, across alula, into base of axillary cell, 

 sometimes including proximal half or less of second basal and anal cells, ockraceous 

 rufous. 



Head : facial "beak" large and thick, dull velvety clove-brown, except extreme 

 tip, which is shining ; jowls clothed with fine black hair ; eyes a hair's-breadth 

 apart on front, facets in upjjer half larger than those in lower half, but difference in 

 size not very noticeable, and no sharp line of demarcation ; antennce clove-brown, 

 distal extremity of style yellow, first and second joints and base of third joint 

 clothed above and below with stilf black hairs, second and following annuli of 

 elongate third joint with a few minute hairs above and below, style also with a few 

 short hairs, and with a longer recumbent hair above and below, just before middle ; 

 palpi black, stont, curving outwards, densely clothed with stiff black hair. Thorax 

 dull, clothed with short and fine black hair ; dorsum witli three approximate and 

 complete longitudinal black stripes, broader in front and converging posteriorly. 

 Abdomen tapering from base of second segment to distal extremity, clothed with 

 short and fine black hair ; dorsum, except elongate median spots, dull, its sides 

 turned downwards, not sharj) ; « large, roughly semicircular, white spot on earh side 

 of first segment, close to distal angle, and a small whitish or yellowish fleck in each 



* For names and illustrationw of colours, sec Kiilgway, .1 yumcnchihirc of Cohrs for Natarnlhta 

 ^Boston : Little, Brown, & Company, IbStJ). 



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