﻿266 LE CONTE— SYNOPSIS OF THE 



0. a n x i u s , oblongus paulo convexus, ater subnitidus, capite dense punctato, vertice vage bifoveato, 

 clypeo rotundato, marginato, antice subemarginato, sutura frontali utrinque profundiore, tborace dense 

 punctato, subcanaliculato, lateribus rotundatis ante medium angustato, angulis posticis obtusis subro- 

 tundatis, elytris punctatis, subtricostatis, costis uniseriatim punctatis, pygidio grosse punctato, propy- 

 gidio antice subtiliter postice grosse punctato. Long. -41. 

 One specimen found by Thos. H. Webb, M. D. of the U. S. and Mexican Boundary 



Commission in the valley of the Gila. The under surface is coarsely punctured, and 



it as well as the pygidium is sparsely hairy. 



Diplotaxis Kirby. 

 The species in this genus are now quite numerous, and in sculpture, color and 

 form resemble each other in many instances very closely ; I have, therefore sought 

 to establish natural divisions by which they may be classified into small groups. The 

 following will serve the purpose. 



A. GENUINJE. Ungues omnes fissi ; (h. e. dente ungue parum breviore) ; spiracula postica baud promi- 



nula ; tborax linea apicali nulla. 



a. Thorax ad angulos plus minusve impressus, angulis anticis praeeipue acuminatis. 



Caput baud carinatum, corpus pubescens ..... 



Caput haud carinatum, corpus supra glabrum . 



Caput carinatum, corpus supra glabrum .... 



b. Thorax ad angulos haud impressus ; caput haud carinatum. 



Clypeus hemihexagonus, angulis acutis elevatis 



Clypeus varius, angulis rotundatis vel nullis .... V. Sp. 9 — 24. 



B. SPUR1JE, Spiracula postica prominula. 



Ungues fissi ........ 



Ungues medio dentati 



C. SPVRIjE. Ungues medio dentati ; spiracula postica haud prominula. 



Thorax linea apicali nulla ....... 



Thorax ad apicem marginatus ........ Sp. 28 — 29. 



I. 



1. D. sordida, nigra, opaca, undique pube erecta brevi fulva vestita, thorace densius pubescente, elytris 

 subtilius, thorace capiteque rugose densissime punctatis, hoc hemihexagono, margine reflexo, antice late 

 emarginato, sutura frontali profunda, utrinque exeavata, tibiis anticis subtridentatis. Long. -47. 



Meloloniha sordida Say, Journ. Acad. Nat. Sc. 5, 197. 



Diplotaxis carbonaria Burm. Lamell. 2, 2nd. 262. 



Pennsylvania and Georgia; rare. The thorax is transversely broadly sulcate near 

 the base and apex ; the basal angles are not at all rounded, the sides are subangu- 

 lated behind the middle, and the anterior angles are subacuminate. Burmeister 

 describes the elytra as being costate ; in one specimen they are so, in another there 

 are faint traces of external striae, and of the three discoidal flattened costse. The 

 teeth of the anterior tibiae are equidistant, the upper one is feeble. 



I. 



Sp. 1. 



II. 



Sp. 2—5 



III. 



Sp.6— 7. 



IV. 



Sp. 8. 



V. 



Sp. 9—2 



. 



Sp. 25. 



• 



Sp. 26. 



, 



Sp. 27. 





Sp. 28- 



