190 geo. h. horn, m. d. 



Series B, 



Elytra without explanate raai'sin, the epipleurfe very narrow and vertical poste- 

 riorly 2. 



Elytra with explanate margin, the epipleurse wide and horizontal 4. 



2. — Elytra blue, head and thorax dull red, form oblong 19. indigoptera. 



Elytra never blue 3. 



3. — Form oblong. 



Body above and beneath cream-yellow, surface smooth wnd shining. 



18. flavida. 

 Elytra yellowish, with a narrowly oval sutural space with irregular 



margins, and which sometimes divides into vittee 20. texaiia. 



Form oval. 

 Elytra yellow, with on oval discal black space, with regular borders, and 

 which never reaches the tips of suture; head always yellow. 



21. thyanioides. 



4. — Elytra broadly oval, sides much arcuate, coarsely punctate, entirely dirty 



yellow, with indistinct vittie, or with the disc entirely black, margin 



only pale 22. liiiibalis. 



Elytra with sides feebly arcuate, or nearly parallel ; the surface yellow, 

 with piceous or brown spots, or bands, or with the di.sc entirely pi- 



ceous 5. 



5. — Thorax very coarsely punctured ; elytra with a more or less evident costa 



from the humeri to apex 2.3. se.xiiiaciilata. 



Thorax finely sparsely punctate, or smooth 6. 



6. — Head coarsely closely punctate 24. suturalis. 



Head sparsely punctate, or almost smooth 7. 



7. —Smaller species, usually with the elytra in great part piceous. 



25. qtiercata. 

 Larger, elytra yellow, ornamented with black spots tending to form trans- 

 verse bauds 26 $$calaris. 



18. iE. flavida n. sp. — Oblong, depressed, scarcely at all oval, shining, be- 

 neath reddish yellow, above yellowish white. Antennse slender, a little longer 

 than half the body, testaceous, slightly darker externally, third joint very 

 little shorter than the fourth. Head entirely smooth, a deep transverse impres- 

 sion between the eyes. Thorax two and a half times as wide as long, very little 

 wider at base, sides arcuate, margin explanate and anteriorly reflexed, front an- 

 gles not dentiform, disc polished. Elytra oblong, sides scarcely arcuate, humeri 

 obtuse, margin not explanate, umbone not prominent, surface smooth, with 

 scarcely any trace of even fine punctures. Abdomen smooth, impunctate. 

 Length .18 — .22 inch. ; 4.5 — 5.5 mm. 



There is no species known to me in our fauna so completely de- 

 prived of surface sculpture as this one. This, with the oblong form 

 and ivory-yellow color, will enable the species to be at once known. 



Occurs at El Paso, Texas (G. W. Dunn). 



19. <E. indigoptera Lee. — Oblong oval, subdepressed, reddish brown, 

 feebly shining, elytra entirely blue. Antennae slender, longer than half the 

 body, rufescent, darker externally, third and fourth joints equal. Head sparsely 



