ClCINDELID/E AND CARABID^E 153 



as wide as the prothorax, the latter nearly similar in form, but having the 

 broad marginal concavity slightly divided behind the middle by an ex- 

 tero-anteriorly projecting feeble ramus of the convexity bounding the 

 lateral impressions externally; under surface deep black, the propleura 

 very minutely, feebly and closely rugulose, not metallic but opaque, the 

 abdomen with a few faint violet glints laterally. Length (o 71 ) 19.8-23.0 

 mm.; width 8.3-9.3 nim. New Mexico. 



The mentum in Diccdus has not been well described; it has a 

 large and deep emargination, the bottom of which is broadly, 

 evenly and feebly sinuate, and it is partially closed by a membranous 

 or coriaceous extension of the base and sides, this part being rec- 

 tilinearly truncate from side to side and of very diverse develop- 

 ment. In splendidus this plate, partially filling the mental emargi- 

 nation, extends through about half its length; it is dense and black- 

 ish in structure and has a median, anteriorly attenuated, longitudi- 

 nally impressed elevation from the base, which upon cursory 

 examination has very much the appearance of a tooth. In speciosus 

 the emargination of the mentum is much narrower, with less flaring 

 sides and the plate referred to is thin, pale testaceous and mem- 

 branous and becomes contorted on drying; it extends anteriorly 

 nearly to the end of the mentum, thus almost completely filling 

 the emargination. This, together with the much smaller head, 

 bifurcating marginal concavity of the pronotum, slightly smaller 

 size and relatively somewhat longer hind tarsi, prompts me to be- 

 lieve that it is specifically different from splendidus, in spite of the 

 almost complete similarity in coloration and form of the strial 

 intervals. The smaller of the two type specimens has the pale 

 membrane of the mental emargination greatly retracted, so that it 

 fills only about a third of the length of the emargination; this 

 male specimen has the head still a trifle smaller, being only half as 

 wide as the prothorax and the latter is shorter and more transverse 

 but otherwise as in speciosus; the elytra are a little shorter and the 

 margins are bluish; its locality is not known. 



There is one very decided mistake in our lists of this genus as 

 now published, relating to dilatatus and dejeani. The latter is quite 

 a different species from dilatatus, which, as taken abundantly by 

 Mr. Champlain in Pennsylvania, agrees in every particular with the 

 description and figure of dilatatus as given by Say. Dejeani, on 

 the other hand, is a much stouter species, with strongly inflated 



