fo 



PHILANTHOCEPHALTJS. 87 



3 (2). Head finely punctured; apical segments of the abdomen yellow* 



4 (5). Length at least 10 millim. (<£); clypeus yellow; anterior tibiae and 



tarsi only yellow in fi'ont mexicanus. 



5 (4) . Length 8 millim. ; clypeus black ; anterior tibiae and tarsi entirely 



yellow punctifrons. 



6 (1). Head and median segment impunctate. 



7 (8). Pubescence on face silvery; legs for the greater part black; the 



second abdominal segment only yellow; wings smoky .... maculiceps. 



8 (7) . Pubescence on face golden ; legs for the greater part yellow ; the 



abdominal segments margined with yellow ; wings hyaline . . . gracilis. 



A. Hind wings with the anal nervure interstitial. (Species 1-3.) 



1. PhilanthocephalllS Mrticeps. (Tab. VI. figg. 2 c?; 2 a, head from in front ; 

 2 b, male organ.) 

 Niger, longe hirtus, facie aureo-pilosa ; capite rugoso-punctato ; segmento mediali leviter punctate ; maculis 



pronoti et apice segmento mediali ilavis ; antennis longis ; alis fumato-hyalinis. c? . 

 Long. 13 millim. 



Hab. Mexico, Atoyac in Vera Cruz (Schumann). 



Head densely covered with long fuscous hair, especially at the sides behind, the 

 clypeus and cheeks with golden hair, rugosely punctured. Clypeus yellow, rounded, 

 not projecting in the middle, finely and sparsely punctured. Furrow from the ocelli 

 broad and deep, narrowed towards the apex. Antennae more than twice the length of 

 the thorax, not perceptibly thickened towards the apex; the third joint not quite twice 

 the length of the fourth. Thorax covered with long fuscous hair ; the mesonotum and 

 the apex of the median segment sparsely punctured ; the mesonotal furrows deep and 

 wide ; the fovea on the median segment twice as long as broad, acute at the base and 

 apex, deep ; the apical furrow wide and deep. Petiole as long as the second, third, 

 and fourth abdominal segments united, the segments impunctate ; the petiole sparsely, 

 the other segments more thickly, covered with long pale hairs ; the third and following 

 ventral segments broadly clothed at the apex with a silvery pile, and the third, fourth, 

 and fifth laterally with long tufted black hair, the apical segment sparsely clothed with 

 pale hairs ; the second segment has a yellow line on either side above. The anterior 

 tibiae and tarsi are yellow in front ; the basal and third joints of the hinder tarsi are 

 dilated gradually from the base and apex on the underside. The second cubital cellule 

 is not much shorter than the third. 



A distinct species, easily known by the longish antennae, the rugose head, the golden 

 pubescence on the face, the dilated first and third hinder tarsal joints, and the lateral 

 tufts of hair on the abdominal segments. 



