350 COLEOPTERA OF NORTH AMERICA. 



6. Apical spur of hind tibije simple. 7. 

 Apical spur of hind tibiae large, emarginate. XII. Diboli^. 



7. Mesosternum more or less elongate. 8. 

 Mesosternum short, sometimes concealed. X. Mniophil^. 



8. Prothorax with posterior transverse impression. 9. 

 Prothorax without posterior transverse impression. 11. 



9. Front coxal cavities open. 10. 

 Front coxal cavities closed, transverse prothoracic imjiression limited. 



VII. Crepidoder^. 



10. Transverse i^rothoracic impression limited each side by a basal longi- 



tudinal groove. VI. Lactic^e. 



Transverse prothoracic impression not limited. V. IlALTicaj. 



11. Front coxal cavities open. 12. 

 Front coxal cavities closed. IX. Arsipodes. 



12. First joint of hind tarsi moderate ; size large. IV. DIS0^'YCH^. 

 First joint of hind tarsi usually very long ; size small. 



VIII. Aphthon^. 



Group I. — Blepharidae. 



This group is represented by a single species of Blepharida 

 in our fauna, which by the distant antennae and general form of 

 body resembles the ChrysoraeJEe, and differs from them chiefly by 

 the thickened hind thighs and bilid claws. 



Group II. — Monoplati. 



This group and the next are remarkable for the inflation of the 

 distal extreniit}^ of the last joint of the hind tarsi, and is distin- 

 guished from it by the front coxae being closed behind. There 

 are many genera in the tropics, especially in South America, but 

 our small representation may be grouped as follows : — 

 Third joint of maxillary palpi not wider than 2d. 2. 



Third joint of maxillary palpi wider tlian 2d ; elytra pilose, striato-punc- 

 tate. Hypolampsis. 



2. Elytra punctate in rows. Pheedromus. 



Elytra uniformly punctate. Pachyonycliis. 



No species has yet occurred in the Pacific region. Hypolampsis 

 is represented by three or perhaps four species: Pha^dromus by 

 PachyonychuH'} par-odoxus Mels., which, by color and form of 

 prothorax, seems to differ from P. WaieHiousei Clark; Pachyo- 

 nychis by dimiaticorms, which is erroneously described by Clark 

 as having the 9-11 joints of the antenufe pale yellow; from a 

 specimen in Dr. LeConte's collection, and from a MS. drawing 

 of Major LeConte it appears that the 9th joint is black, and that 

 the 10th and 11th are yellow ; Hamletia Crotch, has been sup- 

 pressed as not different from Pachyonychis. 



