28 Memoirs on the Coleoptera 



purpuripennis Chd., which is from Mexico but only 7 mm. in 

 length ; the neighboring species all seem to be from South America. 

 I have before me two species of this subgenus as follows: 



Form not very slender and moderately convex, shining throughout, 

 piceous-black, the pronotum feebly diaphanous at the sides; elytra 

 bright metallic greenish or violaceous; legs black, the tarsi piceous; 

 head elongate, three-fourths as wide as the prothorax, with rather 

 large and prominent eyes, the anterior impressions short, parallel; 

 palpi black, with pale tip; antennae very slender, fuscous, fer- 

 ruginous apically, nearly half as long as the body, the third joint 

 evidently longer than the fourth; prothorax but slightly wider than 

 long, the sides subevenly rounded and strongly, equally reflexed 

 throughout, becoming feebly sinuate toward the basal angles*, 

 which are a little more than right but rather sharply defined; base 

 transverse, equal to the moderately sinuate apex, the apical angles 

 obtusely rounded; transverse impressions evident; fovese deeply 

 impressed, smooth, elongate, traceable to the middle; elytra two- 

 thirds longer than wide, nearly twice as wide as the prothorax, 

 parallel and nearly straight at the sides, rounding at base, oblique 

 and feebly sinuate at apex, the tips evenly rounded; striae rather 

 fine but deep and groove-like, nearly smooth, rapidly becoming 

 coarser and deeper at the apex, the scutellar long, parallel; intervals 

 perfectly flat; surface feebly indented on the disk subapically; 

 dorsal punctures three, the first near the third, the others near the 

 second, stria; tarsi with the fourth joint strongly bilobed, the lobes 

 equal on the anterior, unequal on the other tarsi; upper tarsal 

 surface bisulcate. Length (9) 11. 5-12. 5 mm.; width 4.5 mm. 

 Mexico (Guerrero), — Baron *guerrerensis n. sp. 



Form nearly similar but less convex, smaller in size, shining, deep black 

 above, the elytra with feeble bluish lustre, the under surface piceous, 

 with rufous abdomen, the legs rufous; head but little longer than 

 wide, fully four-fifths as wide as the prothorax, with large and 

 extremely prominent eyes, the impressions short and deep but 

 attenuated and approaching the eyes posteriad; palpi long, pale, 

 the second joint twice as thick as the two following, which are very 

 slender, the last a little shorter than the third; antennae long and 

 very slender, fuscous, paler basally, two-thirds as long as the body, 

 the fourth joint a little longer than the third or fifth; prothorax 

 cordate, very nearly as long as wide, the sides parallel and moder- 

 ately though circularly rounded from apex to near the base, where 

 they became distinctly sinuate and thence subparallel for a short 

 distance to the angles, which are nearly right but with the tips 

 bluntly rounded; base transverse, about as wide as the feebly 

 sinuate apex; margins rather narrowly reflexed; surface with fine 

 and very feeble transverse rugulae; transverse impressions both 

 evident though fine, the stria fine between them; foveae and latero- 

 basal regions rather coarsely and sparsely punctate, the foveae 

 shallow; elytra oblong, fully two-thirds longer than wide, twice as 



