140 DESCRIPTIONS OF NEW SPECIES. 



feebly at the middle ; the pubescence is moderately long, though 

 sparse and fine. 



427. M. haldeniani. Nigro-picea, nitida, brevissime parce pubes- 

 cens, thorace transverso, convexo, latitudine duplo breviore, parce re- 

 mote punctulato, lateribus rotundatis. ante basin transversim impresso ; 

 elytris thorace haud latioribus, subtiliter parce punctatis, versus su- 

 turam obsolete bistriatis, macula subbasali ornatis ; subtus rufo-picea, 

 ore antennis pedibusque ferrugineis, ssepe paulo infuscatis, coxis anticis 

 prosterno separatis. Long. "18. 



Middle and Southern States. The thorax is more convex than 

 the preceding, and the pubescence so short as to be almost in- 

 visible. 



Cistela basillaris Say, Jour. Acad. Nat. Sci. Phila. Ill, 26 P, 

 appears to be related to these species, but is described as having 

 the elytra striate, and the thorax hardly punctured. 



428. M. foveata. Elongata, piceo-nigra nitida, pube grisea erecta 

 sat dense vestita, thorace latitudine paulo breviore antice et postice 

 angustato, lateribus rotundatis, convexo parce fortiter punctato, postice 

 utriuque profunde foveato, et ad medium breviter caualiculato, angulis 

 posticis rectis; elytris thorace latioribus, fortiter seriatim punctatis, 

 striis parum impressis, interstitiis subtiliter fere uniseriatim punctatis, 

 macula humerali lsete rufo-testaeea ornatis ; antennis fuscis basi testa- 

 ceis, pedibus laete flavo-testaceis ; coxis anticis prosterno separatis. 

 Long. -20— -25. 



Western States ; not rare. To the same division of the genus 

 belong M. bicolor, a larger species with immaculate elytra, and 

 M. tenuis. The elytra are striate and the pubescence erect, in 

 which particulars, as well as by the smaller thorax, these species 

 differ from those of the first division. 



429. M. tenuis. Valde elongata, piceo-nigra nitida, pube erecta 

 vestita, thorace parvo, latitudine vix breviore, paulo convexo, fortiter 

 haud dense punctato, angulis posticis subrectis deplanatis, postice 

 utrinque profunde foveato ; elytris thorace latioribus, seriatim punctatis, 

 striis vix impressis, interstitiis fere uniseriatim punctatis, gutta parva 

 subhumerali rufo-testacea ornatis ; antennis fuscis, basi ore pedibusque 

 ferrugineis ; coxis anticis prosterno separatis. Long. *22. 



Two specimens ; Detroit, Michigan. The thorax is scarcely 

 wider than the head, which is similarly punctured. 



