1920.] NATURAL SCIENCES OF PHILADELPHIA. 43" 



The marking of the pronotum and cephalic coxae are distinctive 

 features in tonkin(r. It is nearer lactea than albella or fragilis, 

 agreeing with the female of lactea before us in the heavier pronotum 

 with lateral margins serrulate, wider marginal field of the tegmina 

 and heavily milky tegmina and wings. The pronotum is, indeed, 

 slightly heavier and the tegmina and wings very much more heavily 

 milky than in lactea. 



Type.— 9 ; Than-Moi, Tonkin. June and July. (From H. 

 Fruhstorfer.) [Hebard Collection Type No. 523.] 



Size large for the genus, form very slender but not as slender as^ 

 in females of albella. Summit of vertex raised above dorsal margins 

 of eyes a brief distance, straight, transverse to brief areas on each 

 side adjacent to eyes, which are convex and project very slightly. 

 Ocelli very small, well separated, forming a triangle nearly twice 

 as broad as high. Facial scutellum poorly defined, strongly trans- 

 verse, dorsal margin convex in median portion. Pronotum very 

 elongate and slender but slightly heavier than in this sex of lactea, 

 decidedly heavier than in females of albella, lateral margins minutely 

 serrulate, supra -coxal expansion very weak, transverse sulcus dis- 

 tinct. Tegmina with venation as characteristic for genus, falling 

 considerably short of apices of wings (by 5 mm.), marginal field 

 comparatively broad (1.6 mm. in width). Cerci hairy, tapering 

 to acute apices. Supra-anal plate can not be examined without 

 injury to type. Cephalic femora with four discoidal spines, of 

 which the first two are rather closely placed and nearly opposite- 

 each other transversely on the ventral surface, the first being on 

 the internal margin just before the unguicular sulcus;^* ventro- 

 external margin with four elongate spines and all genicular lobes 

 with a small spine; ventro-internal margin with the following for- 

 mula ilililililiiil, of which all the longer spines in the alternating 

 series slant inward and distad to some degree. Cephalic tibiae 

 with ventro-external margin armed with seven spines, of which the 

 first is placed at a distance from the second, this equalling twice the 

 interval between the second and third, the remaining intervals 

 brief; first, third, fourth and sixth spines small, second and fifth 

 of about double that size and length, seventh and apical spine de- 

 cidedly the heaviest and longest. Caudal metatarsus twice length 

 of succeeding joints. 



^* On one limb a single very small spine is found on the ventro-internal margin, 

 before the first discoidal spine. This is apparently an abnormality. 



