116 GEO. n. HORN, M. D, 



Butural region not grooved. 



Elytra with moderately broad oblique space of whitish pubescence extend- 

 ing from the humeri to suture peniusularis u. sp. 



Elytra without whitish space but with a distinct M-shaped black mark 

 behind the middle on each. 

 Base of elytra irregular, an oblong obtuse umbone at middle of base. 



SnCialler species decipiens Hald. 



Base of elytra regularly convex, without umbone. Large species. 



Horrisii Uhler, 

 These belong to the Atlantic fauna except peninsularis which is 

 from Lower California. 



A. peninsularis n. sp. — Form moderately robust as in Morrisii, piceous 

 clothed with brownish pubescence. Head coarsely but very distantly punctate, 

 clothed with brownish pubescence, on the occiput very much paler. Antennse 

 brownish, each joint with two rings of cinereous pubescence. Thorax twice aa 

 wide as long, strongly angulate at the sides, surface coarsely and deeply punc- 

 tured clothed with variegated brownish pubescence, disc bituberculate and a 

 carina extending from apical margin to middle. Elytra with coarse deep 

 punctures near the base which become more distant and less deep posteriorly, 

 surface clothed with brownish pubescence variegated with darker and paler 

 Spaces, and with a broad oblique cinereous spot extending from the humeri 

 toward the suture and two slightly oblique dark spaces behind the middle. 

 Body beneath and femora sparsely clothed with cinereous pubescence, tibiffi 

 annulate. Length .48 — .64 inch; 12 — 16 mm. 



This species has nearly the form of Morrisii but is even more robust, 

 its markings approaching those of quadrujihha. It belongs to a group 

 of species occurring along the west coast of Mexico, many examples 

 of which I saw in the collection of Mr. H. W. Bates, but differs from 

 them all. I cannot, however, suggest any comparisons and leave 

 further remarks to Mr. Bates to whom the species is known. 



Occurs in the Peninsula of Lower California. 



Sub-tribe II. — Acanthocinini. 



The scape of the antenna is in the form of a very elongated cone, 

 very little broader externally. 



The genera form the following groups : 



Lateral tubercle of thorax at the middle. Tarsi broad Lagochiri. 



Lateral tubercle behind the middle. Tarsi slender except in Mecotetartus. 



Females without elongated ovipositor Liopl 



Females with -elongated ovipositor Acanthocini, 



The group Dectes has been united with the Liopi. 



Group I. — Lagochiri. 

 In this group the lateral tubercle of the thorax is at the middle. 

 The females without ovipositor. The pro- and mesosternum are 

 moderately broad, the former channeled, the latter truncate at tip. 



