IPHIAULAX. 



347 



^^ The group of I. peesectjtok. 



Keel on the second segment dilated at the base, the remainder sharp, narrow, reaching 

 nearly to the suturiform articulation ; the space on either side of it but slightly 

 depressed, and marked with some stout striations ; the lateral furrow oblique. 

 Suturiform articulation wide, strongly longitudinally striated ; the second furrow 

 deep and usually striated. Body reddish, the head and legs black ; wings 

 blackish. (Species 27-33.) 



A. No keel on the side of the second segment dividing the oblique depression into two. 



(Species 27-32.) 



\ 



1 (2) . Abdomen narrow, longer than the head and thorax united ; second x 



cubital cellule on the lower side longer than the third cellule ; 

 the second segment not striated on either side of the keel; 

 wings smoky ; terebra nearly as long as the thorax and abdomen 

 united abaculus. 



2 (1). Abdomen broad, not longer (or scarcely longer) than the head 



and thorax united, the second segment more or less striated 

 on either side of the keel. 



3 (4) . Stigma testaceous ; wings lightly smoky ; the second segment 



punctured on either side of the striated central part .... argentifrons. 

 4i (3) . Stigma black or fuscous ; wings dark smoky ; the second segment 

 not punctured. 



5 (6). Second segment strongly striated to the apex; wings with a dark 



cloud at the apex persecutor. 



6 (5) . Second segment not strongly striated to the apex ; wings without 



a dark cloud at the apex. 



7 (8) . The second furrow in the abdomen broad and crenulated ; stigma 



light testaceous on the lower side aztecus. 



8 (7) . The second furrow narrow, not crenulated ; stigma black. 



9 (10) . The basal part of the keel on the second segment nearly as long as 



broad ; the petiole with an oblique slope ; abdomen as long as 



the head and thorax united montezuma. 



10 (9). The basal part of the keel on the second segment much broader 

 than long ; petiole with almost a vertical slope ; abdomen not 

 much longer than the thorax chontalensis. 



a. The second furrow in the abdomen crenulated. (Species 27-29.) 



A27. Iphiaulax persecutor. 



Ferrugineus ; capite, antennis, prosterno pedibusque, nigris ; alis fumatis, apice fusco ; apice abdominis seg- 



mento 2° striolato. $ . 

 Long. 10 millim. ; terebra 6 millim. 



Hab. Guatemala, El Eeposo 800 feet (Champion). 



2yy 2 



