180 CHARLES A. BLAKE. 



The genus Apterogyna, which does not appear to have been found 

 in North America, is remarkable for the two anterior segments of 

 the abdomen being constricted and nodose, and for the great length 

 of the antennae in the male, being nearly as long as the body, and 

 for the curious neuration of the wings. 



The genus Bradynobcenus, also exotic, is characterized by the large 

 quadrate head, having the anterior and posterior angles acute, and 

 the thorax of the female being divided in two parts ; the femora and 

 tibiae are more robust than in the other genera of the family. 



In Myrmosa the head is subglobose, eyes small and round; the 

 thorax ovate and the anterior wings have one marginal and four 

 submarginal cells. The females of our species appear to be unknown. 



In the genus Methoca the ocelli are said to be distinct in both sexes, 

 head subglobose in the female, transverse in the male, eyes ovate, 

 thorax trinodose in the female and oblong in the male. 



Nothing definite appears to be known of their habits, although 

 they are supposed to be parasitic. Owing to the dissimilarity of the 

 two sexes Latreille considered the male belonging to a distinct genus, 

 Tengyra, which was arranged among the Scoliidae. 



I have divided the family into nine genera, in all of which the 

 females are apterous, and may be tabulated as follows : 



Antennae of male flabellate.^ 1, Psammotherma. 



Antennae simple in both sexes. 



Eyes ovate, emarginate in the male, entire in the female 2, Ulutilla. 



Eyes round, polished in both sexes 3, Sphserophthalma. 



Eyes large, round ; ocelli large ; antennae long and slender ; wings hyaline, 



body unicolorous, shining 4, Photopsis. 



Eyes round and polished ; thorax binodose ; abdomen petiolate, petiole slender 



and cylindrical at base 5, Chyphotes. 



First and second abdominal segments nodose, anterior wings with two sub- 

 marginal cells, marginal cell wanting *6, Apterogyna. 



Mandibles elongate, arcuate, the maxillary palpi 3-jointed, labial palpi 

 2-jointed; thorax divided in two parts *7, Bradynobsenus. 



Eyes small, round ; head subglobose, mandibles tridentate in the male, uniden- 

 tate in the female ; wings with one marginal and four submarginal 

 cells ; margins of the abdominal segments crenate, tridentate at apex. 



8, Myrmosa. 



Eyes ovate, ocelli placed high on the vertex; antennae filiform, mandibles ar- 

 cuate in the female ; head subglobose ; scape of male antennae very 

 short ; wings with one elongate marginal cell which extends nearly to 

 the tip of the wing; three submarginal cells 9, Methoca. 



* These are exotic. 



