380 MEMOIRS ON THE COLEOPTERA 



latitude of Pennsylvania, and they are particularly abundant in the 

 regions bordering the Gulf of Mexico. Some of the few Mexican 

 and South American species placed in this genus by Bates, such as 

 sculptilis and opaculus, certainly are far from being typical Loxan- 

 drus, and should probably be separated generically. The genus is 

 also recorded by Bates as occurring in Celebes and Australia, but 

 I doubt the correctness of the identification very much. Possibly 

 Loxandrus tetrastigma Bates, from Mexico, may also form a differ- 

 ent genus, as it differs decidedly in habitus from the normal forms. 

 In fact it seems probable that the genera allied to Loxandms should 

 form a natural tribal group in the subfamily Pterostichinae. 



In regard to our own species, I have in my collection twenty-six, 

 scarcely more than a fourth of which can be identified with any pre- 

 viously described and of these a few are doubtful, owing to the 

 very inadequate descriptions of some earlier authors. These spe- 

 cies may be described as follows : 



Elytra uniform in coloration 2 



Elytra with a small rounded sutural rufous spot near the apex; size 



small 20 



2 Prothorax broadly reflexo-explanate at the sides posteriorly; largest 



species of the genus 3 



Prothorax not distinctly reflexed at the sides posteriorly 4 



3 Body rather broad, more parallel, moderately convex, deep black, 

 the elytra distinctly iridescent; legs black, the tibiae and tarsi pice- 

 ous; head well developed, nearly three-fifths as wide as the protho- 

 rax, the anterior sulci small and feebly impressed; antennae long, 

 very slender, infuscate, the three basal joints and the palpi ferru- 

 ginous; prothorax large, fully two-fifths wider than long, parallel, 

 the sides very evenly arcuate from apex to the broadly rounded 

 basal angles; apex deeply sinuate, evidently narrower than the base, 

 which is feebly sinuate medially as usual, finely margined laterally; 

 transverse impressions not evident; apical margin without trace of 

 a fine incised parallel line except laterally; stria fine, biabbreviated; 

 surface with a few scattered punctures medially toward base, the 

 elongate foveae rather coarsely impressed; lateral explanature mod- 

 erate; elytra oblong, one-half longer than wide, barely a fifth wider 

 than the prothorax, the striae coarse and very deeply impressed, 

 strongly punctured, the punctures obsolete posteriorly; intervals 

 strongly convex; subapical sinus short, distinct. Length (cf 9 

 12.0-13.5 nim.; width 4.6-5.1 mm. Louisiana (Monroe). Eleven 



specimens saphyrinus Chd. 



Body much narrower, more elongate-suboval, rather more convex, simi- 

 lar in coloration throughout, the elytra having feebler iridescence; 

 head narrower and rather more elongate; antennae not quite so 



