JAMES CHESTER BRADLEY 203 



Middle coxae unarmed; tubercles on mesosternum oblique, without trun- 

 cate anterior margin; sixth and following ventral segments on each side 

 with strong mammiliform tubercles, the fifth also with a trace of a 

 tubercle barbigera n. sp. 



5. Dorsal abdominal segments with long, dense, rather tomentose, orange 



pubescence grotei Blake 



Dorsal segments with much shorter and sparser, red or black, erect, pubes- 

 cence, not at all tomentose briaxus Blake 



6. Inferior border of mandil)les with a deep emargination and large tooth near 



the base; ocelli small, the distance of the posterior pair from the ej'es 

 equal to from three to four and one-half times their transverse diam- 

 eter (7) 



Inferior margin of the mandibles not emarginate; ocelli usually large, the 

 distance of the posterior pair from the eyes (except in rufosignata) 

 equal to or at most two times their transverse diameter; mesosternum 

 not tuberculate (11) 



7. Pygidium with a low median impunctate ridge, not elevated posteriorly, 



but continued on the apical half of the segment by a low but sharp me- 

 dian carina which has no lateral arm.s; sixth, seventh and eighth ventral 

 segments with mammiliform tubercles, those on the sixth minute; middle 

 coxae without subapical teeth, but with an anterior swelling. 



promethea Blake 

 Pygidium with a median, raised, impunctate, polished ridge, strongly ele- 

 vated posteriorly, and there abruptly terminated by the spreading arms 

 of a Y-shaped carina which extends to the apex of the segment, the arms 

 of the Y being usually very short, in one species the ridge itself almost 

 wanting, the Y-shaped carina alone distinct (8) 



8. Arms of the carina on the pj-gidium spreading broadly, enclosing a broad 



ridge or elevated platform ; fifth and sixth ventral segments with a papilla 

 on each side, that on the sixth prominent, while the seventh and eighth 

 have oblique, low, not angular nor toothed, carinae; middle coxae with 

 a weak posterior subapical tooth, and a sharply carinate swelling on the 



anterior part rufa Lepeletier de Saint Fargeau 



Arms of the carina on the pygidium very short, the tip of the ridge being 

 therefore very narrow; fifth ventral segment without and sixth without 

 or in one species with very small lateral tubercles (9) 



9. The vertex between the anterior and posterior ocelli prominently elevated 



on each side, the posterior ocelli in an almost vertical position, their 

 distance from the eyes four and one-half times their diameter; pubescence 

 of abdomen sparse and mostly dark red, with a small quantity of fine, 



appressed, coppery pubescence floridensis Blake 



The vertex not unusually elevated between the ocelli, the posterior pair 

 more oblique, their distance from the eyes three and one-half times their 

 diameter; pubescence of abdomen dense and longer, orange colored, and 

 with much fine, appressed, golden pubescence on the apex of each seg- 

 ment (10) 



TRANS. AM. ENT. SOC, XLII. 



