JAMES CHESTER BRADLEY 



309 



CONTRIBUTIONS TOWARD A MONOGRAPH OF THE 



MUTILLIDAE AND THEIR ALLIES OF AMERICA 



NORTH OF MEXICO 



BY JAMES CHESTER BRADLEY 



III. THE MUTILLIDAE OF THE EASTERN UNITED 



STATES 



A Key to the Genera and Subgenera of Mutillidae known 



TO OCCUR IN THE EASTERN UNITED StATES 



Males 



1. Eyes deeply emarginate (2) 



Eyes not deeply emarginate (3) 



2. Petiole short, transverse, nearly cylindrical, not at all sessile with the second; 



third to seventh dorsal segments with a median longitudinal keel. 



Ephuta Say 

 Petiole enlarged at apex and sessile with the second segment, or nearly so; 

 dorsal segments without or only the last one with a median keel. 



Mutilla Linnaeus, subgenus TimuUa Ashmead 



3. Head transversely quadrate, the posterolateral angles carinate; petiole 



enlarged posteriorly and sessile with the second segment. Color entirely 



black . . Pseudomethoca Ashmead, subgenus Pseudomethoca Ashmead 



Head sometimes very long behind the eyes, but with the postero-lateral 



angles always rounded, never carinate (4) 



4. Mandibles robust and of peculiar shape, forming with the concave clypeus 



and labrum a basin, ' usually they are truncate and tridentate, sometimes 



deflexed at apex and often with a deep notch on the inferior margin . . (5) 



Mandibles slender and of normal shape, never with an external notch . . (7) 



5. Ocelli very small, the posterior removed from the anterior by more than the 



length of their longer diameter, and from the compound eyes by many 



times the same (diurnal species) (6) 



Ocelli large, the posterior removed from the anterior by not more than the 

 length of their longer diameter, and from the compound eyes by two or 

 three times the same (nocturnal species); mesosternum armed with a 

 ridge or process. Photopsis Blake, subgenus Odontophotopsis Vicreck 



6. Mesosternum simple, unarmed. 



Sphaerophthalma Blake, subgenus Sphaerophthalma Blake 



Mesosternum armed with a pair of tubercles, carinae or peg-like jn'ocesses. 



Sphaerophthalma Blake, subgenus Photomorphus \ iereck 



1 There are many species in the western United States to which this charac- 

 terization is not applicable. 



TRANS. AM. ENT. SOC, XLII. 



