404 PROCEEDINGS OF THE ACADEMY OF [June^ 



with three rows of paler spots. Apex of ovipositor sub- 

 lanceolate, armament of same heavy. 

 C. — Form rather stout. 



D. — Coloration dark mummy brown, spots of dorsal surface 

 of female abdomen moderate in size. Ovipositor more 



than half as long as caudal femur carolinus Scudder. 



DD. — Coloration wood brown, spots of dorsal surface of female 

 abdomen extremely large. Ovipositor less than half as 



long as caudal femur carolinus hrevicaudus Bruner. 



CC. — Form somewhat more slender. (Coloration usually con- 

 siderably paler than in carolinus) 



carolinus neomexicanus Scudd. 

 BB. — Size small. Maxillary palpi immaculate bone white. Colora- 

 tion solid, very dark brown, dorsal surface of female abdo- 

 men immaculate. Apex of ovipositor lanceolate, armament 

 of same very heavy confusus Blatchley. 



The present key is of necessity somewhat involved owing to the 

 difficulties found in the present genus and commented upon at the 

 beginning of this paper. 



In some species it may be seen that certain characters, which are 

 of little or no value in the majority of species, are of great importance. 

 The color pattern of the head is distinctive in Nemobius maculatus, 

 ambitiosus, griseus and griseus funeralis. The coloration of the 

 maxillary palpi is distinctive in Nemobius carolinus and its races and 

 particularly so in confusus. 



Certain important differences exist in the North American species 

 of the genus which are of sufficient value to warrant the erection of 

 four subgenera and the recognition of Walker's Argizala as another 

 subgenus. A study of all the species of Nemobius of the world would 

 probably show the advisability of considering some of these groups 

 separate genera, while many other groups not found in North America 

 would constitute still other genera and subgenera. 



The genotype of Nemobius is Nemobius sylvestris of Europe, which 

 species belongs to a group differing very widely from any of those 

 here treated in the following combination of characters. Spines of 

 caudal tibia unmodified in both sexes, disto-ventral spurs of same 

 unequal, but not nearly as much so as in the North American species 

 having this character. Ovipositor longer than caudal femur, nearly 

 rigidly straight; apex very narrowly sublanceolate and wholly 

 unarmed. Color pattern of head distinctive. Nemobius sylvestris 

 bears a superficial resemblance to Nemobius aynbitiosus. 



Examination of other exotic species shows that the genus Nemobius 



