1922] NATURAL SCIENCES OF PHILADELPHIA 209 



median veins adjacent to near apex, where the former runs suddenly 

 off as one of the veinlets to the costal margin. Cephalic tibiae 

 with auditory foramen internally flattened conchate, externally 

 inflated conchate. Cephalic coxal spine thickened, but not lamel- 

 late as in that genus. Limbs, particularly the cephalic, strongly 

 hirsute; spinulae of the same compound character as found in 

 Morsimus. 



Chondroderella sexguttata new species. Plate XV, figure 6. 



This species, compared with the brief original description of the 

 Bornean C. rubromarginata (Haan) is seen to be very closely related, 

 differing only in the small but very distinctive tegminal markings. 



Type: <?; Singapore, British Straits Settlements. (From C. F. 

 Baker.) [Hebard Collection, Type no. 817.] 



In addition to the features given in the generic description, we 

 note the following: 



Size small, form rather slender, structure very delicate. Vertex 

 acute, feebly concave mesad, extending slightly beyond margins 

 of antennal scrobes and there slightly reflexed to the sharply 

 rounded apex. Pronotum with two medio-longitudinal rows of 

 slender but prominent tubercles, separated by a short interval; 

 margins tuberculate, the surface elsewhere very faintly subtuber- 

 culate; three transverse sulci present, of which the median alone is 

 deep and alone cuts the median line of the pronotum, this occurring 

 mesad. Tegmina and wings fully developed and capable of sus- 

 tained flight. Tegmina very broad, anal field small, its free margin 

 concave before and convex at the stridulating vein; thence the 

 sutural margin is straight, distad curving to the rather broadly 

 rounded apex, the costal margin convex, decidedly so proximad; 

 anal field beyond stridulating area thickly filled with minute, 

 irregular veinlets; median vein branching mesad, connecting veins 

 of discoidal field in most cases perfectly transverse; transverse 

 veins of scapular field not numerous, weakly oblique, the more 

 proximal forking irregularly. Supra-anal plate nearly twice as 

 long as wide, lateral margins weakly convergent, rounding distad 

 into the truncate apex. Cerci simple, cylindrical, moderately 

 elongate, tapering weakly to the rounded apex, which is armed with 

 a minute tooth directed inward. Subgenital plate narrowed 

 suddenly mesad, the distal half very slender, expanding very 

 slightly distad and bearing very delicate, paddle-shaped styles. 

 Ventral femoral margins armed with minute compound spines, 

 except externally on the caudal femora, where the more distal 

 spines, though small, are considerably larger. Cephalic internal 

 2 and 5, cephalic external and 1, median internal 1 and 4, median 

 external 5 and 6, caudal internal 8, caudal external 10. 



General coloration warm buff tinged with light green. Antennae 



