ON THE INSECTS FEOM NEW BEITAIN. 391 



Van der Wulp has figured the leg of E. argyropus (from New Guinea) in Termes. 

 Fiizetek, 1898, PI. XX. Fig. 6: in it the tarsus is less enlarged, and all the four 

 following joints are simple and symmetrical. E. argentipes Walk., according to the type 

 in the British Museum, has the hind feet very differently shaped. 



Family ORTALIDAE. (Muscidae acalyptratae.) 



Lamprogaster austeni, n. sp. PI. XXXV. Fig. 11 $ ; 11 «, 11 &, 11 c. 



Thorace dorsoque abdominis viridi-purpureis, capite pedibusque flavis, illo vertice 

 fusco ; abdomine subtus niembranaceo utrinque versus apicem vesiculo protuberante ; 

 alis subopacis, basi et dimidio anteriore aurantiacis. Long. 12 m.m. 



Antennae received in deep, elongate ear-like depressions ; first joint hardly visible, 

 second moderate, third elongate, twice as long as the second, bearing at its base an 

 arista twice as long as itself, and bare except for a few fine hairs at the base. Head yellow 

 with the vertex broadly fuscescent along the middle, a dark streak on each side below 

 the antenual cavity ; palpi yellow, labellum blackish. Thorax metallic, shining, feebly 

 pubescent, underface of scutellum yellow. Wings elongate, rendered dull by a dense dis- 

 tinct strigosity, the anterior part, and even the veins, dark yellow : squama ver}' large, 

 completely covering the halter. Legs clear yellow. 



The metallic tint varies in colour, and may be in parts bluish or purplish. 



The male has a large white, round vesicular prominence at each side of the abdomen 

 (Fig. 11 h), and the genitalia project between the pair of prominences. The female has 

 a very large, pap-like projection, instead of the round prominence of the male ; at the 

 tip, between the two paps, there is a rounded prominence from which projects the slender, 

 two-segmented ovipositor (Fig. 11 c). 



The peculiar, vesicular structures of the abdomen shrivel after the insect is taken 

 from spirit and dried : and they also, I anticipate, only take on their full development in 

 life when the insect is sexually mature and occupied with reproduction. The species is 

 very like L. elonguta van der Wulp (from Batchian) but independent of the abdominal 

 structure it differs by its less elongate form, and by the colour of the undersurface of the 

 abdomen and hind coxae being yellow. 



I have named this remarkable fly in honour of E. E. Austen, Esq., of the British 

 Museum, Natural History, who kindly assisted me in tracing its affinities. No one, un- 

 familiar with the intricate but unsatisfactory state of classification of Muscid flies would 

 dream of assigning a place to this insect amongst the Acalyptrate Muscidae, as the halters 

 are hooded in the most perfect manner. 



GlRAFFOMYlA, n. g Muscidarum acalyptrataru 



m. 



Corpus elongatum, nitidum, pubescentiae destitutum. Prothorax elongatus ; caput 

 libcrum permobile, a thorace utrinque scleriti cervicale elongato separatum. Pectus valde 

 prominulum, ]ie(iibus intermediis et posterioribus contiguis, a pedibus anterioribus longe 

 remotis. Scutellum bispinosum. Caput marium interdum processu elongato ornatum. 



53-2 



