48 COLEOPTERA OF NORTH AMERICA. 



them separated, and in tlie case of carinulatus rather widely, so 

 that in the present genus a character becomes insignificant, which 

 in other parts of the series is of the highest importance. 



On the other liuud, tlie apparent increase of the number of the 

 abdominal segments to seven or eight has been exaggerated in 

 value very far beyond its importance. If we examine the species 

 of any of the genera which emit from the anus a liquid, whether 

 explosively or not, it will be seen that the structure in no way 

 differs" from that of Brachymis, except tliat the latter has a 

 broader si.xth segment, which, being truncate or slightly emargi- 

 nate, allows the genital armature to become more plainly visible 

 as a segment. Galerita and any of the larger Dryptini will illus- 

 trate this structure. 



The species of Brachynus are found under logs and stones, 

 usually in damp situations and often in colonies. Those in our 

 fauna have the head, thorax, and legs yellowish, the elytra blue. 

 They have not yet been separated in any satisfactory manner. 



Tribe XXIX.— BROSCIIVI. 



Antennae modei'ate in length, with a variable number (three to 

 five) of basal joints glabrous. Head not constricted, but usually 

 gradually broader behind the eyes, froiit not sulcate, one supra- 

 orbital setigerous puncture, and often with a post-orbital cicatrix. 

 Eyes oval, distant beneath from the mouth. Clypeus moderately 

 prolonged with lateral setae. Labrum moderately prominent, 

 slightly emarginate. Mandibles arcuate at tip with a setigerous 

 puncture on the outer side. Maxillre with the inner lobe hooked 

 at tip, ciliate or spinulose within, outer lobe moderately stout, 

 biarticulate ; the palpi rather stout, the last joint longer than the 

 third, elongate-oval or fusiform. Mentum broad, deeply emargi- 

 nate, toothed or not; the ligula moderately prominent, truncate 

 and bisetose at tip, the paraglossa? adherent, sometimes free for a 

 short distance, and rarely longer than the ligula; the palpi rather 

 stout, the last joint a little longer tiian the second, more or less 

 oval in shape (impressed beneath in Iliscodera), the second joint 

 bisetose in front. Thorax more or less ovoid, the sides narrowly 

 margined and bisetose, the posterior seta in front of the hind 

 angles. Body pedunculate, scutellum in the peduncle. Elytra 

 not margined at base, sides narrowly inflexed, margin not inter- 

 rupted posteriorly, but with a short internal plica, disk without 



