TACHYPOEID-E. MEGACHONCS. 165 



The very much elongated terminal joint of the antennae of Calli- 

 cerus, united to its biarticulate palpi, respecting which Mr. Kirby 

 remarks that in Mr. Spence's specimen he could not detect any 

 minute joint at the apex, as in Aleochara, sufficiently point out the 

 distinctions of this genus. 



-j-Sp. 1. Spencii. Nigra, obscura, thorace punciis duobus obsoleiis impressis, 



pedibus piceis. (Long, corp, l^r lin.) 

 Ca. Spencii. Kirby MSS.—Steph. Catal. 268. No. 2770. 



Black, with a very short obscure pubescence^ rather smooth : head orbiculate, 

 with a frontal fovea between the eyes : mouth rufo-piceous : thorax with a 

 very obsolete dorsal channel, and on each side an obsolete fovea: elytra 

 subquadrate:* abdomen linear, with the apex obtuse: legs reddish, with 

 the femora fuscescent: antennae nearly as long as the thorax, with the ter- 

 minal joint rather acute. 



" Once taken in England by Mr. Spence." — Kirby MSS, 



Genus CCCCXCIV.— Megaceonus* mAi. 



Antennas rather long, 11-jointed, mostly thickened towards the apex, the basal 

 joint elongate, incrassated exteriorly, the second short, obconic, the third 

 elongate, also obconic, the seven following very short, nodose, the next or 

 terminal one more or less elongate-cylindric, obtuse, or subconic. Palpi 

 filiform, incrassate, with the terminal joint longer than the preceding, sub- 

 acuminate : head small, rounded, sometimes inflexed : thorax transverse, 

 with the hinder angles rounded : elytra broad : abdomen elongate, subconic, 

 with the apex setose : legs moderate ; tibix externally spinose. 



Like the preceding genus, the terminal joint of the antennae, at 

 least in the type, is remarkably long, cylindric, and obtuse ; the 

 palpi are filiform, with the apical joint longer than the preceding, 

 and subacuminate ; the body generally slender, elongate, attenuated 

 at each end, with the surface usually smooth, having only a few large 

 impressed punctures. 



Sp. 1. analis. Ater, nitidus, elytris pedibus, anoque testaceis, antennis fuscis 



articulis primis et ultimo testaceis. (Long. corp. 2| — 3 lin.) 

 St. analis. Olivier.— Me. analis. Steph. Catal. 268. No. 2771. 



Black, shining, smooth, glabrous : head subcordate, with the mouth and palpi 

 rufous : elytra rather elongate, rufous, with punctured strise : scutellum 



Mfyo, magnus, aicpwv, extremitas mcmbri. 



