NEW SPECIES OF CARABIDEOUS INSECTS. 857 



are pitchy black ; a slight blueish tint is observable in cer- 

 tain lights on the under parts of the body, and on the under 

 side of the prothorax there is a faint green hue : a few long 

 hairs spring from the sides of the thorax and elytra, and also 

 from the fore part of the head and above the eyes. The tho- 

 rax is rather narrower than the elytra ; its upper surface is 

 convex, the sides are rounded, and so are the posterior an- 

 gles, the hinder margin is slightly indented in the middle and 

 near the posterior angles : the breadth of the thorax is about 

 one third greater than its length ; the dorsal channel is very 

 indistinct, and there is a faint, posterior, transverse depres- 

 sion ; along the outer margins are seven or eight large punc- 

 tures. The scutellum is large and almost semicircular. The 

 elytra are very convex and almost smooth ; their length is 

 less than one third greater than their breadth ; on each ely- 

 tron is a row of punctures, which commences at the shoulder, 

 and ends nearly at the apex of the elytron ; excepting near 

 the shoulder (where the punctures are close to the outer mar- 

 gin) this row runs parallel with and at a short distance from 

 the outer margin of the elytron, and on the margin itself a 

 second row of punctures is observable ; these are rather wide- 

 ly separated, and each puncture gives root to a long hair ; 

 a few punctures, also giving root to long hairs, are also ob- 

 servable on the shoulder, and again towards the apex of the 

 elytra; these are situated above the first-described row. — 

 There are no strice on the elytra. On each of the abdominal 

 segments is a transverse row of punctures, each having a hair 

 like those on the outer margins of the elytra. The legs are 

 rather densely clothed with short bristly hairs, especially on 

 the tihi(e of the posterior and middle pair : on the outer mar- 

 gin of the anterior tibice there are no hairs ; these tihicB are 

 much dilated at the apex, and the outer portion is produced 

 and pointed ; in the male it terminates nearly in a line with 

 the apex of the basal joint of the tarsus, whilst in the female, 

 where it is larger, it terminates opposite (or nearly so) to the 

 base of the fourth joint of the tarsus : a row of punctures is 

 observable on the under side of all the femora. Length of 

 thorax in the female very nearly 3 lines ; width of ditto 4j- 

 lines : length of elytra 6^ lines ; width of ditto 4| lines in 

 the female. 



This species was obtained by Mr. Darwin at Bahia Blanca, 

 North Patagonia. 



Sp. 5. Odon. Curtisii. 



Odon. latissimus, supra laevis, niger; suttus violaceo-niger : antennis, man- 

 dibulis, palpis, pedibusque piceo-nigris ; thorace 'elytrisque apud margi- 

 nem submetallice relucentibus, illo subviridi, his colore purpurascente. 



