Mar., 1909.] Fall : Synopsis of OcHODiEUS. 35 



This species is apparently not rare in Kansas, at least it has been 

 taken in considerable numbers both by the late Professor Snow and by 

 Mr. Knaus. It has perhaps been confused in collections with biar- 

 matus. I have considered the possibility of this species being the 

 duplex of LeConte, unrecognized by Horn, who at the time of 

 writing declared that he could find no type. The brief tabular char- 

 acters given by LeConte constitute the only description and are as fol- 

 lows : " Middle lobe of front scarcely or not at all margined ; elytral 

 stride deep, strongly punctured, head with two transverse ridges." 

 The size is given as 6 mm. and the type is said to be from Texas 

 (Ulke Coll. ). In katisanus the front is very distinctly margined and 

 the elytral striae are not especially strongly punctured ; there is there- 

 fore little probability that the two are identical. I however wrote to 

 Dr. Holland, of the Carnegie Museum, asking if the Ulke collection 

 contained the type of duplex, but have received no answer to my 

 communication. 



It is a fact worthy of remark that in all our species having the 

 sutural angle dentiform, the upper tooth of the front tibiae is nearer to 

 the middle tooth than to the base of the tibia. Of the other species 

 represented before me {jdkei, striaius and estriaius lacking) this is true 

 only oi pectora/is. 



10. 0. biarmatus Lee, Trans. Am. Ent. Soc. , 1868, p. S'- 



One of our smallest species and in my experience the one most 

 abundantly represented in collections. Horn remarks that the sexes 

 are alike in having a tooth on the lower edge of the hind thighs at 

 about one third from the knee. My own observation is that this tooth 

 is present only in the male. This species is the only one in our fauna 

 having the frontal margin terminating each side in an acute tubercle 

 in the male. The species occurs in Kansas, Texas and New Mexico. 



11. 0. peninsularis Horn, Coleop. of BajaCal., Suppl. I, Proc. Cal. Acad. Sci., 



V, 1895, p. 224. 



Of this species Horn writes : " Most closely related to diar/natiis 

 and more especially to the female (of the latter) which has not the 

 clyi^eal tubercles of the male. ' ' He finds no armature of either femora 

 or tibiae, but in certain specimens which he assumes are males, the 

 hind tibije appear somewhat shorter and more hairy. The size given 

 is 4.5-5 mm. 



Habitat. — Lower California (San Lazaro and Sierra El Taste). 



