192 GEO. H. HORN, M. D. 



as long, distinctly broader at base than apex, sides arcuate, margin rather broadly 

 explanate, front angles dentiform, surface finely alutaceous, sparsely indistinctly 

 pnnctulate; scutellura black. Elytra oval humeri rounded, margin narrowly 

 explanate and slightly reflexed, surface rather coarsely and closely punctate, 

 smoother near the apex, color yellow, with a common discal black space, never 

 reaching the apex, variablt in extent. Ejiipleurpe pale. Body beneath and legs 

 reddish yellow, abdomen smooth, sparsely indistinctly punctate. Length .15 — 

 .18 inch. ; 4—4.5 mm. Plate VI, fig. 8. 



This species resembles, in niinature, Disonycha discoidea. It varies 

 but little, except in the extent of the black discal space, which at 

 times leaves but a narrow pale border, while it may become so narrow 

 as to occupy but half the space between the suture and margin on 

 each side. 



Occurs west of the Mississippi River from Dakota to Texas. 



22. <E. limbalis Mels. — Broadly oval, subdepressed, moderately shining, 

 yellowish testaceous, darker beneath, elytra with short fuscous vittse, often con- 

 fluent in a large discal spot. Autennje slender, longer than half the body, testa- 

 ceous, darker externally, ihird and fourth joints equal. Head pale, occiput 

 darker, fuscous, never piceous. surface alutaceous, sparsely punctate, a deep 

 interocular impression. Thorax nearly three times as wide as long, widest at 

 base, sides arcuate, margin broadly explanate, front angles not dentiform, surface 

 alutaceous, obsoletely, sparsely punctulate. Elytra broadly oval, margin ex- 

 planate and slightly reflexed, umbone moderately prominent, slightly impressed 

 within, ^surface moderately, coarsely and closely punctate, with fuscous vittse as 

 follows : a very nai-row sutural vitta, not reaching the base, a short oblique vitta 

 each side of scutellum, a slightly oblique vitta beginning at the umbone extend- 

 ing two-thirds to apex, a shorter vitta from the umbone parallel with the lateral 

 margin ; these vittje may be one or all absent, or all confluent in a large discal 

 space. Epipleurge yellow, wide. Body beneath darker than above, sometimes 

 pale bi'own. Abdomen shining, sparsely punctate. Length .14 — .20 inch. ; 

 3.5—5 mm. Plate VI, fig. 7. 



This is the most broadly oval species in our fauna. Tlie elytral 

 sculpture varies in degree from relatively fine to coarse. The mark- 

 ings vary as indicated above. This species is closely related to ocu- 

 lata and suhUneata, which occur south of our fauna, in both of which 

 there is a similarity of style of elytral marking. Ours is especially 

 related to oculata as figured, but which seems to me doubtfully de- 

 termined in Biol. Cent. Am. 



The typical specimen described by Melsheimer is one of those in 

 which the elytra are black, with the outer and apical border nar- 

 rowly pale, 'resembling thyamoides, and also quercata. From the 

 former it may be distinguished by the ej)ipleural structure and from 

 the latter by the more oval (not quadrate) elytra with much more 



