240 PROCEEDINGS OF THE ACADEMY OF [1899. 



spines may be formulated thus: i a IS p 11, ii a 9-11 p 20, iii a 

 13 p 18; (11) tarsal nails with the usual inferior tooth acute, 

 much shorter thau the tip of the nail itself. 



All wings: (13) arculus between the first and the second ante- 

 nodals, (13) one submedian cross-vein, (i^) nodal sector very 

 slightly waved, (15) at least some double celjs between the sub- 

 nodal sector and the supplementaiy sector next below, (16) one to 

 three cross-veins between the median vein and the principal sector 

 from the origin of the subuodal sector to the nodus, (17) discoidal 

 triangles with one cross-vein. 



Front wings: (18) last antenodal not continued to the median 

 vein, (19) sectors of the arculus arising by a very short common 

 stalk equal in length to the lower division of the arculus (*. e., that 

 part of the arculus from the origin of the stalk to the submedian 

 vein), (20) one hypertrigonal, (21) triangle with its basal side 

 twice as long as its anterior side, (22) internal triangle of three 

 cells, (23) four posttriangular cells, then three rows to the level of 

 the last antenodal, thence increasing, (24-) submedian space reach- 

 ing to the level of the fourth antenodal. 



Hind wings: (25) sectors of the arculus arising by a common 

 stalk which is almost as long as the arculus, (26) no hyper- 

 trigonals, (27) apex of the triangle not reaching outward (dis- 

 tad) to the level of the triangle of the front wings (it reaches to 

 the level of the fourth antenodal of the hind wings), (28) triangle 

 with its basal side in prolongation of the arculus, (29) three post- 

 triangular cells, then two rows to the level of separation of the 

 median and principal sectors, thence increasing, (30) sectors of 

 the triangle arising from the same point, (31) four subbasal sectors 

 (Kirby) start from the postcostal vein. 



(32) Genitalia of second abdominal segment of male not promi- 

 nent, (33) hamule bifid at tip only, 



■ The insect for which this genus is established has a great super- 

 ficial resemblance to the African Hemidigma, Kirby, a fact Avhich 

 has suggested the name here proposed. From Hemistigma, Hem- 

 istigmoides differs by the characters above numbered 1, 2, 5, 8, 15 

 (except in one wing out of twenty-four wings of Hemistigma 

 studied for this purpose), 17 (for the hind wings), 19 and 27. It 

 may be added here that two males, three females of Hemistigma 

 affinis Ramb. have the arculus at the second antenodal (compare 



