102 Psyche [June 



Still a fourth member of this group is Olixon Cameron ('87) 

 described from Panama and later redescribed by Kieffer ('11) 

 from Mexico, as Saphobethylus. Turner and Waterston ('17) 

 have shown these two genera to be complete synonyms as the 

 type species of both are identical. Cameron regarded Olixon as 

 an anomalous Braconid, but thought that it showed resemblance 

 to certain Bethylids, particularly on account of its greatly 

 thickened fore legs. Kieffer placed Saphobethylus in the Bethy- 

 lidse without question, but Turner and Waterston have referred 

 the insect to the Rhopalosomatidse. 



All four genera are closely related, but are, I think, un- 

 doubtedly separable on good characters. They may be distin- 

 guished by means of the following key, which is based solely on 

 the females, except in the case of Olixon. 



1. Second segment of abdomen much the longest 2 



Second segment of abdomen only a little longer than 



third, head transverse, vestigial wings present, reach- 

 ing to base of abdomen, but without nervure; tarsal 

 claws with a small subapical tooth . . .Olixon Cameron. 



2. Tegulse well developed; anterior wings present, but 



reduced in size and reaching to the tip of the propo- 

 deum; antennae much longer than the head and 



thorax together, slender 3 



Tegulee and wings alisent; antennae stout, barely as 

 long as the head and thorax Algoa Brues 



3. Mandible with a long apical tooth and with three 



minute subapical teeth on the inner edge; head seen 

 from above transverse. .. .Harpagocryptus Bridwell 

 Mandible with a long apical tooth, the inner teeth 

 large and well-developed; head seen from above as 

 long as broad Nealgoa gen. nov. 



Of the three genera, Algoa and Nealgoa are distinguished 

 by a number of characters which are indicated in the generic 

 diagnoses that follow; likewise Algoa and Harpagocryptus are 

 separable by several clear-cut structural differences. Harpa- 



