MEXICAN HYMENOPTERA. 9 



1?.. Ichneumon jugiosus, n. sp. 



9 . — Very similar to centrosus, with the yellow color brighter, the 

 antennae have a broad white annulus, the scape feri'uginous, third joint 

 longer than fourth; the metathorax has no stigmatal spot nor lateral 

 stripe; the posterior femora are black at tips within, their tibiae dusky 

 at tips ; abdomen less sericeous, apex truncate in profile. Length 42- 

 lines. 



One 9 specimen. May be the 9 of centi-osus. 



14. Ichneumon limitaris, n. sp. 



% . — Pale lemon-yellow, the black markings much as in the proceed- 

 ing species, with the following differences : — the black mark starting 

 from base of antenna? and covering the ocelli, extends on to the occi- 

 put obliquely, margining it posteriorly for a short distance and leaving 

 the orbits broad ; in the two preceding species this mark is straight 

 across from eye to eye, leaving no yellow orbital line, while in species 

 10 and 11, this mark is oblique and free, i. e. not touching either the 

 eye or posterior margin of occiput; cheeks full, convex, giving the head 

 a broad appearance ; antennae long, slender, subserrate, black above, 

 with a narrow testaceous annulus about the middle, beneath testaceous, 

 blackish at tips, scape yellow, spotted above with black ; the prothorax 

 is yellow with a black spot on each side ; the metathorax has only a 

 basal black mark on each side above; all the femora are blackish be- 

 hind and at base above and the tarsi are blackish except basal joint; 

 first abdominal segment is yellow with three subapical black spots above ; 

 rest of abdomen marked as in Jugiosics. Length 5 lines. 



One % specimen. 



15. Ichneumon tenuicornis, n. sp. 



% . — This resembles cenfrosus xevy much in general shape of body, 

 color and markings ; in this the head is transversely compressed, eyes 

 smaller than usual, fiice broad, cheeks flattened ; antennt'B short, slen- 

 der, very much attenuated at tips, the joints indistinctly defined; scu- 

 tellum convex, the sides acutely carinated ; dark mark on metathorax 

 rugose ; basal fovese of second segment large and very deep ; the black 

 mark across the vertex has a confluent, oblique line behind each eye; 

 spot beneath each eye and the palpi black; antennae blackish, with a 

 yellowish annulus before the middle, scape yellow beneath; lateral 

 carinae of scutellum black ; mesothorax with four yellow lines more de- 

 veloped than in cenfrosus; metathorax with a subbasal black mark on 

 each side above, continued narrowly and obliquely to lateral apical 

 angle; pleura with a short line beneath anterior wing and a spot low 



TRASS. AMER. EXT. SOC. ( 2 ) MAY, 1S6S. 



