AMERICAN COLEOPTERA. 143 



from Callida. In the dissections which I have made and figured (Trans. 

 Am. Ent. Soc. ix, pi. viii, figs. 93, 94, 95), there will not be found any 

 remarkable differences between these genera and no reason is apparent 

 why Chaudoir should not have included the present genus in his Callidides. 

 It is however treated apart (Bull. Mosc. 1877, i, p. 243), with no sug- 

 gestions as to its position, being simply compared with Tecnophilus with 

 which it has far less in common than Callida or Plochionus. 

 The species at present known are distinguished as follows : 



Body winged, elytra very little narrowed at base. 

 Color blue or green. 



Elytral striae fine, not impressed ; head and thorax metallic-green, elytra 



blue or violet , viridicollis Lee. 



Elytral strise deeply impressed on the disc, finer externally; body above 



entirely blue or bluish-green amcena Lee. 



Color castaneous caslanea n. sp. 



Body apterous, elytra narrowed at base. 

 Color uniformly bluish or greenish \ iridis Dej. 



P. viridicollis Lee. — Body beneath bluish-green, legs black with slight 

 purplish tinge, head and thorax metallic-green, elytra blue. Front each side 

 broadly impressed and punctured, vertex and occiput very sparsely punctate. 

 Antennse piceous, three basal joints paler. Thorax not wider than long, very 

 narrowly margined, sides feebly arcuate and gradually narrowing to base, hind 

 angles not prominent, base regularly arcuate; disc moderately convex, median 

 and subapical lines distinctly impressed, surface transversely wrinkled and punc- 

 tured along the apex, sides and base. Elytra oblong, a little less than twice 

 as long as wide at base, surface finely striate, strise punctured, more distinctly 

 near the base, more finely and distantly posteriorly, intervals flat, very sparsely 

 punctate. Body beneath smooth, a few punctures at the sides of the pro- and 

 metasterna. Body winged. Length .40 inch ; 10 mm. 



Male. — The anterior tarsi have four joints very distinctly dilated and biseriately 

 lamellate beneath, the middle tarsi are similar but a little less dilated. The anal 

 segment is entire and with two setigerous punctures each side. 



Female. — Tarsi slender. Anal segment with three punctures. 



I can not understand by what misconception Chaudoir considers this 

 species purpurea Say, which is a true Callida, nor am I aware that 

 Dr. LeConte has at any time united his amcena with the present 

 species. Specimens were sent by me to Chaudoir as stated by him 

 and the only explanation of the error may be found in a possible 

 confusion of the labels. 



The correct synonymy will be found at the end of the paper. 



Occurs in Texas extending northward to Kansas. 



P. amcena Lee. — Body above and beneath uniformly blue or green, more 

 or less metallic, legs black with a tinge of purple. Head oval, front coarsely 

 punctured each side, more sparsely on the vertex and occiput. Antennse piceous, 

 three basal joints paler. Thorax distinctly wider than long, otherwise similar 



