642 Goleoptey^ological Notices^ VI. 



10 — Mesosternum and its parapleurse as in Anthicus Taiiarthriis 



11 — Tarsi shorter than tlie tibiae, tlie penultimate joint slightly dilated. 



]¥otoxus 



Tarsi very long and filiform, longer than the tibiae, the penultimate joint 



evenly cylindrical and not at all thicker IWecyiiotarsiiS 



It is unfortunate that in this lineal arrangement Tanarthrus 

 has to intervene between Amblyderus and Xotoxus, but it would 

 be still more out of place among the genera allied to Tomoderus, 

 where it must otherwise be placed. 



DII. AXDIIS n. gen. 



The two species separated under this name, together with 

 Formicilla, are peculiar in having the acute side-pieces of the 

 prosternum behind the coxfe more inwardly prolonged than in 

 Anthicus, so that they coalesce at or near the middle, thus closing 

 the coxal cavities. In the other genera, as I find by dissecting 

 numerous divergent forms, the inferior flanks of the prothorax 

 form angular inward projections behind, which are wideh' sepa- 

 rated by a deep emargination of the common coxal floor, and the 

 coxal cavities are consequently broadh' open. The mesosternum 

 in this genus extends in one extremelv large unbroken polished 

 plate from side to side of the body, and is largely visible from 

 above in the reentrant humeral angle ; the prominent lateral 

 edges of this plate bear a sparse fringe of long stiflT bristling setai. 



In the form of the head Dilandius resembles Ochthenomus to 

 a great degree, the outline being oblong-suboval, with the eyes 

 small and anterior. 



Our two species are verA' slender ant-like insects, distinguish- 

 able at once from Malporus and Lappus by the form of the head, 

 disposition of the elytral vestiture, and by the fact that the lateral 

 constriction of -the prothorax extends across the dorsal surface, 

 giving rise to two convex lobes.* The}* may be known as fol- 

 lows : — 



Dorsal constriction of the prothorax strong; white pubescent fascia of the 



elytra oblique 1. inyrniecops 



Dorsal constriction feeble; j)ubescent fascia transverse 2. uuicus 



* In the second group of Lajjpus there is a large dorsal gibbosity near the 

 base of the pronotum, but this is a true protuberance, and is not produced by 

 a dorsal extension of the lateral constriction; in gihhithnrax and othei-s of this 

 grou}), there is no transverse depression before the protuberance. 



