MONOBIA. 129 



Gen. MOXOBIA Sa 



Lip moderate. Labial palpi composed of three or four articles, 

 the fourth rudimentary and soldered when it exists. Maxillary 

 •palpi composed of five articles. 



Mandibles lengthened, channelled, lobulate toward the end on 

 the inner border and terminating in a point as in the Odynerus. 



Metathorax excavated. Abdomen sessile, conical or ovoid, not 

 fusiform. 



The Monobia are Odynerina among which the number of 

 articles of the palpi is diminished and which for this reason 

 approach the Monlezumia and Synagris. Their bodies offer 

 different forms, peculiarly varied like the Odynerina, such as : 

 metathorax rounded, or marginate or bidentate, the abdomen 

 more or less conic or even rather ovoid, etc. 



The buccal organization of the Monobia is evidently the same 

 as with the Monlezumia ; however, the labial palpi are more 

 variable, and one sees in these organs the rudiments of the 4th 

 article more clearly developed. 



The Monobia differ from the Monlezumia by their wide and 

 excavated metathorax and by their abdomen, conical or at least 

 sessile and not pediculate nor fusiform. Yet here also one meets 

 intermediate types which form the transition from one genus to 

 the other; (see the 3Ionobia egregia and variabilis.) 



Nevertheless the greater number of species have wholly the 

 forms of the Odynerus and cannot be distinguished from this 

 genus but by the dissection of the mouth. 



Division I. 1 

 Labial palpi composed of three article, the 3d elongate. 



A. Metathorax bispinose. 



1. H. CalifOTllica Sauss. — Gracilis, fermginea, sparse punctata; 

 metanoto foveolato, utrinque spinoso; antennis superne ultra medium 

 nigresceutibus ; macula frontal i flava ; vertice nigro, fascia arcuata et 



1 Perhaps this division should not be separated from the second, but 

 not having the insects before my eyes, it is impossible for me to decide. 

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