MONOBIA. 137 



calipennis and is distinguished from it by the two spines of the 

 metathorax, by the post-scutel without any crest, by its wings 

 of which the extremity has but very little white, etc. 



Hab. The hot regions of Mexico. I have taken a specimen 

 near Tampico. 



b. Metathorax without distinct spiniform angles. 



9. M. apicalipemiis Sauss. — Nigra, capite et thorace densissime 

 puuetatis ; abdomine ovato, velutino, tenuiter punctato, segmentorura 

 inargine paulo distincti.as et densius punctato; capite satis minuto ; 

 clypeo truncato, subbidentato ; thorace antice paulo coarctato, biangu- 

 lato ; post-scutello paulum transversiui oristato, postice truncato; 

 metanoto lsevi, truncato, lato, rugoso, in medio foveola lsevi instructo, 

 sed ubique rotundato, can this nullis, et nullomodo bidentato; clypeo, 

 mandibulis, spatio post-oculari, antennarum scapo subtus, tibiis anticis 

 antice, tarsis anticis apice unguibusque, rufis ; alis nigris, apice albidis. 

 J . Longit, 16 mm. 



Monobia apicalipennis Sauss. Vespid., I, 98, 5 ; pi. xv, fig. 6 (III, 168, var.?) 



Hab. South America. (Typus in actoris museo.) 



This species differs from the M. nigripennis, by its strongly 



angulate prothorax and by its rounded metathorax. 



(I found in Mexico one of the Apidse which could very easily 



be confounded with this Monobia.) 



C. Abdomen slightly fusiform, enlarging as far as the extremity 

 of the 2d segment; the 1st segment a little funnel-shaped, 

 divided by a feeble longitudinal groove. Thorax lengthened. 



These insects have the appearance of Montezumia and one 

 would readily confound that with those of this genus, were it not 

 for the rudiment of the 4th article of the labial palpi. They form 

 the transition from Montezumia, and one can almost class these 

 with that genus from the formation of their body; however, the 

 structure of their palpi, their sessile abdomen having the first 

 segment in form of a bell rather than funnel-shaped and above all 

 their metathorax excavated and bidentate, assigns them their 

 place among the Monobia. 



1©. HI. variabilis n. sp. — Ferruginea, dense punctata ; clypeo subbi- 

 dentato; metanoto ferruginoso, foveola striata et utrinque dente instructo ; 

 abdomine basi angustiore, segmento primo rlavo-limbato ; capite et 

 mesonoto nigro-variis ; alis obsouris, violascentibus. 



Total length, 18 ram.; wing, 15 mm. 



