284 HYMENOPTEBA. 



the postscutellum, a small mark on either side of the metanotum above, and a large 

 mark (dilated on either side at the apex along the transverse keel), yellow. Metathorax 

 more strongly punctured than the mesothorax ; the metanotum almost rugosely punc- 

 tured, with an arcuate transverse keel at the apex ; metathoracic spiracles oblique, oval. 

 Abdomen densely pilose, the pile longest at the apex, which is compressed laterally ; 

 petiole of nearly equal width throughout, depressed in the centre above, with a some- 

 what triangular tubercle on the lower side at the basal third; the minute lateral 

 tubercles placed immediately above this ; spiracles round ; first and second segments 

 pale testaceous, the first broadly black in the middle, the second black along the sides 

 above ; third segment black along the sides ; the apex of the fourth, and the remaining 

 segments entirely, black ; cerci testaceous. Legs pilose ; middle coxae blackish before 

 and behind, the sides yellowish ; tips of the tarsi fuscous. Areolet oblique, triangular, 

 but slightly angled where the recurrent nervure is received towards the apical fourth ; 

 longly pedunculated. 



12. Mesoleptus (?) bucephalus. 



Mesoleptus (?) bucephalus, Cressoix, Trans. Am. Ent. Soc. 1868, p. 36 ( d 1 ) *. 

 Hab. Mexico, Hacienda del Potrero, near Cordova l (Sumichrast). 



13. Mesoleptus (?) anguina. 



Mesoleptus (?) anguina, Cresson, Proc. Acad. Phil. 1873, p. 391 ( ? ) \ 

 Hab. Mexico, Orizaba 1 (Sumichrast). 



MESOLEIUS. 



Mesoleius, Holmgren, Sv. Ak. Handl. 1854, p. 62. 



The species I have included in this genus agree better with the characters of 

 Mesoleius than of Tryphon. They, however, are scarcely typical, and might be included 

 in Tryphon if the metathoracic areae were not completely obsolete, Tryphon having, at 

 least, some of them present. 



l. Mesoleius costaricensis. 



Niger ; annulo antennarum, clypeo, facie laterali, orbitis anticis, linea prothoracis, tegulis, scutello, postscutello, 

 metanotique apice lsete, flavis ; pedibus testaceis ; tibiis tarsisque flavis ; basi eoxarum, femoribus posticis 

 supra tibiarumque posticarum dimidio apicali, nigris ; alis fere fumatis, stigmate testaceo. tf . 



Long. 10 millim. 



Hab. Costa Rica, Cache (Rogers). 



Closely punctured all over, covered with close pale pubescence, which is longest on 

 the pleurae and breast. Antennae covered with microscopic pile ; third joint as long as 

 the succeeding two together. Face scarcely projecting in the middle ; the orbits in 

 front, the face (except a black line down its centre, this black line being prolonged 



