AMERICAN MUTILLID.E. 251 



before apex, altogether much as in group occidentalis. First ab- 

 dominal segment in male more or less nodose, varying in length, 

 with coarser punctures than the second, always considerably nar- 

 rower ; in female it is always smaller than second, not uniting evenly 

 with it. Tibial spurs slender, not serrated. Marginal cell lanceo- 

 late or subtruncate ; two submarginals, with a very faint trace of a 

 third in some species. Pygidium of female large, finely granulated. 



The chief points of difference between the males of this and 

 group anthophorce lie in the sculpture and shape of first abdominal 

 segments. Both sexes of no species have been observed, whereas 

 in group anthophone the sexes of at least one species have been 

 correlated. 



This group is the American representative of the European 

 Tricho lab lodes Rad., differing in having no trace of a third sub- 

 marginal cell. 



MALES. 



First segment seen from the side distinctly nodose 2. 



First segment scarcely nodose, gradually broadened from base to apex (head, 



thorax and first segment castaneous brown, segments 2 et seq. black ; 



legs and antennse pallid) iligriveiltris Fox. 



2. Pubescence more or less golden or yellowish 3. 



Pubescence pale or subfuscous 4. 



3. Pubescence on dorsuluni and abdominal segments 2 and following yellowish, 



otherwise pale fuscous; head and legs black ; wings more or less fus- 

 cous on apical third iinperialis Blake. 



Pubescence throughout yellowish : the insect entirely fulvous, sometimes 

 becoming quite dark : wings dark fuscous throughout. 



E<lwar<lsii Cress. 



4. First segment forming a rather distinct node at apex 5. 



First segment more of a convex, rather than nodose, form at apex, or it may 



be described as slightly nodose 10. 



5. Abdomen more or less blackish or fuscous 6. 



Abdomen not at all dark 8. 



6. Abdomen from base of segment 2 black ; dorsulum not dark 7. 



Abdomen from apex of segment .3, femora, tibiae and dorsulum blackish ; 



head not dark ; antennte and tarsi testaceous clar» Cress. 



7. Legs and antennae pale testaceous ; first segment elongate, rather narrow. 



mesilleiij^is Ckll. 

 Legs and antennae black ; first segment broader bellerophon n. sp. 



8. Wings fuscous in greater part: pubescence subfuscous. .ferruginosa D. T. 

 Wings hyaline in greater part 9. 



9. Wings crossed by a fuscous cloud from the stigma, the latter dark. Length 



6-9 mm (lanaiiN Blake. 



Wings clear, with a yellowish caste; stigma pale. Length 15 mm. 



Iiclicaoii n. sp. 



TKANS. AM. ENT. SOC. XXV. FEBRUARY, 1899. 



