i6o Records of the Indian Museum. [Vol. X, 



Key to the vSpecies of the Genus Philorvs, Kellogg. 



Second longitudinal vein simple without branches ; a cross-vein present 

 between the 4th and 5th longitudinal veins. 



A, Eyes contiguous, bisected by a simple groove. 



I. P. ancilln. Osten-Sacken. 



A3 Eyes separated b\ a broad front; not bisected by a cross-band or 

 groove. 



b, Submarginal cell with a long pedicel. 



2. P. vosemife, Osten-Sacken. 



bg Submarginal cell sessile. 



C^ Second vein curving downwards, nearly parallel to the third vein ; 

 forking of 5th and 6th vems at nearly ^ its length from the base. 



3. P. bilohafa, Eoew. 



C2 Second vein curving upwards, in an opposite direction to that of the 

 third \'ein ; foiking of the 5th and 6th veins at nearly A its length from the base. 



.4.. P. bionis, sp. nov. 



Philorus bionis, sp. nov. 

 (Plate xvi, figs. 1-7.) 



o' 9 . Head (figs. 4, 5) transverse, narrower in width than the 

 thorax; nearly black in colour; ocelli conspicuous. Proboscis 

 brownish yellow, somewhat shorter than the vertical height of 

 head in length. 



Eyes widel)^ separated; not bisected by any non-facetted 

 cross-band ; facets all of the same size, pubescent all over, black 

 in colour. 



Antennae (figs. 6, 7) 14-jointed; the scapal and ist flagellar 

 joints brown in colour, the remaining joints black. 



Palpi 5-jointed; the ist rather a short joint, the 2nd longer 

 with a sHghtly swollen head, the 3rd pear-shaped with the ter- 

 minal part coloured dark brown, the 4th a trumpet-shaped joint, the 

 last nearly oblong in shape with a small peduncle by which it is 

 inserted on the side of the 4th. 



Mandibles absent in both & and 2 . 



Thorax strongly arched on the dorsal side, with a distinct 

 transverse suture. Dorsum is black with a trefoil-shaped yellowish- 

 white mark on the posterior region. This is much more conspicu- 

 ous in the 9 than in the cf . 



Abdomen: rf terga clove-brown in colour, sterna and pleura 

 nearly white ; hypopygium conspicuous, clove-brown in colour. 

 9 terga light cinnamon-brown in colour, much less chitinised 

 than in the cr*. A black line is seen on each side which is really 

 formed by the tracheal vessel with its branches going to the 

 abdominal stigmata. 



