AMERICAN COLEOPTERA. 183 



ral third. Elytra rather deeply striate, striae closely punctate, intervals 

 /ivex, moderately densely punctulate. Body beneath sparsely punctate, 

 •ngth .14— .20 inch; 3.5—5 mm. 



Occurs in Texas and New Mexico. 



O. frontalis, Lee, New Species, p. 76; Trans. Am. Ent. Soc, 1868, p. 51; 

 omplex, Lee, loc. cit., p. 51. — Color as in musculus. Clypeus hemihexagonal, 

 aargin singls, an acute tubercle near the frontal suture; front coarsely and 

 '.eeply punctured and with a moderate transverse ridge. Thorax moderately 

 lensely jiunctato-granulate, a slight impression near each side, median line 

 moderately deeply impressed at basal half. Elytra striate, striae with rather 

 .;oarse punctures, intervals feebly convex, moderately regularly bi- and triseri- 

 ately punctulate. Body beneath very sparsely punctulate. Length .20-^.26 

 inch; 5 — 6.5 mm. 



I have united comjy/ex with frontalis as it has all the essential 

 characters. The front however was described as having three apical 

 tubercles, two of" which are represented by a darker spot such as occurs 

 In every species at the end of the frontal suture. The posterior and 

 anterior femora of the male have a small acute tooth at middle which 

 may entirely disappear in less developed specimens. 

 Occurs from Texas to Florida. 



O. striatum, Lee, Proc. Acad., 1854, p. 222; Trans. Am. Ent. Soc, 1868, 

 p. 51. — Size, color and sculpture of musculus. Clypeus broadly hemihexagonal, 

 margin single, vertex with a short transverse carina. Median line of thorax 

 rather deeply impressed at basal half. Length .20 — .22 inch; 5 — 5.5 mm. 

 Occurs in New Mexico and Arizona. 



O. sparsus, Lee, Trans. Am. Ent. Soc, 1868, p. 51. — Similar to the pre- 

 ceding but with the thorax relatively shorter. Clypeus hemihexagonal, margin 

 single, head sparsely punctured, and with a moderately prominent acute verti- 

 cal tubercle. Thorax sparsely punctured, median line moderately deeply im- 

 pressed at basal half. Elytra striate, the inner striae with coarse, the outer 

 with fine punctures, intervals slightly convex very sparsely punctulate. Body 

 beneath sparsely punctulate. Length .18 — .22 inch; 4.5 — 5.5 mm. 

 Occurs in New Mexico and Colorado. Females only known. 



I am unable to identify the following species. 

 O. duplex, Lee, Trans. Am. Ent. Soc, 1868, p. 51. 



Of this insect 1 can find no type, and I have seen nothing corre- 

 sponding with it. I have suspected that it might be a well marked 

 opacus, but I do not find any specimens of this from Texas. 



MACRODACTYI.US, Latr. 



Several important characters appear to have entirely escaped notice, 

 and the species although few in number are in a somewhat confused 

 state. 



The antennal club does not diflfer notably in length between the 

 two sexes. 



