176 GEO. H. HORN, M. D. 



0. marginatus Lee. Proc. Acad. 1862, p. 42; .86-.95 inch, 22-24 mm.— Lower 



California. 

 0. cruentus Lee. ibid.; .75-.85 inch, 19-21 mm. — Lower California. 

 0. corallinus Lee. ibid.; .70-.80 inch, 18-20 mm. — Utah and New Mexico. 

 0. jocosus Horn supra; .48-.60 inch, 12-16 mm. — Colorado and Arizona. 



In the first two species I have observed faint traces of costae on the 

 disc of the elytra near the base. 



The genus Oxoplus as stated by LeConte is closely allied to Tylosis, 

 and differs in having the sides of the thorax obtusely spinous and the 

 disc without callosities. In both genera the antennae are 12-joiated in 

 the males, the terminal joint being longer than the eleventh in Tylosis 

 and shorter in Oxoplus. I am satisfied that in Oxoplus there is a true 

 articulation between the last two joints and that the eleventh is not 

 merely appendiculate. The female antennae are 11-jointed. 



The genus Oxoplus as described b}' Lacordaire may possibly not be 

 congeneric with that intended by LeConte, the type of ornamentation 

 being so very unlike as to suggest the existence of structural differences 

 on comparison. 



TYL,OSIS Lee. 



In the Biologia (vol. v, p. 81) Mr. Bates speaks of T. sellata as a 

 distinct species. The series in my cabinet will not only demonstrate that 

 maculata and sellatd are inseparable, but that the color variation is still 

 greater. In two specimens before me the two median and posterior black 

 spots have become confluent into a large discoidal spot covering fully two- 

 thirds of the entire area of the elytra ; from this every variety occurs 

 until nothing remains on the elytra except the two subapical spots. 



€RO?>(SIDIUI^ Lee. 



C. liunieralisi Lee. Journ. Acad. 2, iv, p. 28. " Sordide luteus, pubescens 

 thoraee rotundato, longius pubescente, rude punetato, callis parvis duobus notato, 

 elytris dense punetatis, vix obsolete bicostatis, linea brevi humerali nigra ornatis; 

 subtus obscurus, densissime pubescens." 



" Dull testaceous, densely pubescent; punctures of elytra dense finer behind, a 

 short humeral vitta black, which in one specimen has a continuation near the tip 

 (indicating that it may be entire m some individuals." — New Species 1873, p. 197. 



I reproduce the two descriptions given by Dr. LeConte as important 

 points in the one are omitted in the other. In the first description the 

 two callosities of thorax are noted, in the second the possibility of the 

 humeral stripe becoming an entire vitta is hinted at. 



The two specimens in the cabinet of Dr. LeConte have, as far as I 

 know, remained the only ones to which we could refer. 



