ART. 16 WASPS OF THE SUBFAMILY BEACONINAE MUESEBECK 17 



Inner spur of posterior tibia decidedly more than half the basitarsus; last 

 segment of hind tarsi not or scarcely longer than the third and consider- 

 ably shorter than the second; cheeks and temples not bulging so promi- 

 nently; the cheeks, in front view, sloping rather evenly 5. 



4. Head and thorax entirely testaceous, very rarely with propodeum more or 

 less blackish; legs testaceous, except usually all the trochanters, the apex 

 of posterior tibiae, and the posterior tarsi, which are generally blackish 



3. fulvescens (Cresson). 



Head black; thorax with pectus, meso- and meta-pleura, and propodeum 



mostly black; anterior and middle coxae, the posterior coxae usually and 



all trochanters black. 4. medius (Cresson). 



6. Head usually yellow, sometimes frons and vertex blackish, very rarely head 

 entirely black; basal segment of ijosterior tarsi barely more than twice the 

 second; first abdominal tergite only very slightly longer than propodeum; 

 radial cell measured along wing margin not more than half as long as sec- 

 ond abscissa of radius; length normally 4 to 5 mm. .5. pallens (Cresson). 

 Head black, face occasionally reddish medially; basal segment of posterior 

 tarsi much more than twice the second; first abdominal tergite much 

 longer than propodeum; radial cell measured along wing margin distinctly 

 more than half as long as second abscissa of radius; length normally 7 to 



8 mm 6. 



6. Anterior and middle legs black or blackish; meso- and meta-pleura, propo- 

 deum, and pectus nearly always mostly black; propleura more or less 



wrinkled anteriorly... 6. divisus (Cresson). 



Anterior and middle femora and tibiae testaceous; the black markings on 

 thorax usually confined to the venter; propleura polished 



7. nigriceps (Cresson). 



1. CRASSOMICRODUS NIGRITHOKAX, new species 



Female. — Length 4 mm.; face more than twice as broad as long 

 from antennal foramina to clypeus; clypeus large, prominent, its 

 width at apex greater than the distance from antennal foramina to 

 clypeus; face and clypeus smooth and polished, with long sparse 

 pubescence; malar space a little longer than half the eye height; 

 cheeks and temples broad, full, polished; the former somewhat 

 rounded; eyes rather strongly convex, broadly oval, distinctly broader 

 than the temples; frons smooth and polished; two low widely sepa- 

 rated tubercles between antennae; ocell-ocular line at least three 

 times the diameter of an ocellus; antennae 32-segmented in the 

 type, nearly as long as the body; the scape large and stout; parap- 

 sidal furrows deeply impressed, finely foveolate; the mesonotal lobes 

 and scutellum polished, the latter fully as long as broad; furrow in 

 front of scutellum with about from six to eight distinct pits; pro- and 

 meso-pleurae polished; meso-pleural furrow foveolate; propodeum 

 sloping gradually from base to apex, not distinctly rounded, finely 

 rugulose, with a small polished area medially at apex; metapleura 

 mostly smooth, with scattered punctures ; propodeal spiracle short 

 oval; posterior coxae polished; inner spur of posterior tibia a little 

 longer than half the metatarsus; last segment of hind tarsi some- 



