NATURAL SCIENCES OF PHILADELPHIA. 115 



15. lohneumon arrogans, n. jp. 



9. Ferruginous, opaque; apex of mandibles black; antennte 

 tricolored red, j^ellow, and black ; thoracic sutures black ; wings 

 blackish, with a broad, median, yellow band, the stigma and ner- 

 vures within the band yellow, the remainder black ; legs black, 

 anterior pair more or less ferruginous; base of first segment of 

 abdomen, and basal sutures of second and third, black, venter 

 yellow. Subrobust, densel}' punctured ; head large, subquadrate, 

 buccate ; antenna? slender, involute, joints short and robust; scu- 

 tellum flat above, sides abrupt; metathorax truncate behind, 

 elevated lines well defined ; abdomen elongate, slightl3' constricted 

 at base, gastrocoeli rather small and deep ; apex of first segment 

 with rather large punctures. Length 5^-6 lines. 



%. More slender; scutellum sometimes tinged with yellowish; 

 legs ferruginous, varied with 3^ello\y, the posterior pair generally 

 black, with apex of tarsi yellow. Length G^ lines. 



Orizaba; Cordova. (Sumichrast, No. 159.) 



16. Iclmeumon cupidus, n. sp. 



9. Brown-ferruginous, opaque; antennas brown-ferruginous 

 at base, yellow iii middle and black at tips ; wings yellow-h3-aline, 

 anterior pair with two broad transverse blackish bands, and apex 

 dusky ; nervures, except where passing through the bands, yel- 

 lowish ; tips of posterior tibia blackish, their tarsi yellowish ; 

 base of third abdominal segment occupied by a rather broad black 

 band, and sometimes a blackish stain at base of second segment. 

 Head flat, not buccate; eyes large; antennre long and slender, 

 not involute, joints elongate ; scutellum flat above, sides abrupt, 

 with carinate edge; metathorax densel}^ sculptured, with a silvery 

 sericeous reflection in certain lights, gradually sloping to apex, 

 with short, subacute, lateral tubercles, elevated lines obsolete ; 

 legs subrobust ; abdomen minutely sculptured ; gastrocoeli trans- 

 verse, rather large and deep. 



% . More slender in form, with the face and anterior legs tinged 

 with vellowish. Length 4^ lines. 



Orizaba. (Sumichrast, No. 110.) This closely resembles Cryptus 

 cestus, Sa}', in size and ornamentation. 



17. Ichneumon opaculus, n. sp. 



% 9. Opaque black; orbits, interrupted above, two dots be- 

 neath antenna?, two more on upper margin of clypeus, upper mar- 



