54 ENTOMOLOGICAL NEWS. [Feb., '17 



In the smallest male the marginal bead does not join the 

 basal bead and the submarginal groove at base passes continu- 

 ously onto the basal border of the propleura. Similar inquiry 

 into the variations of the other species shows the same varia- 

 tions in specimens caught in the same geographical area. The 

 list includes californicus, dcjeani, sequoiarum, Iccontcl and 

 ambiguus. 



VARIATIONS IN OMUS BLAISDELLI. 



The male has the mental tooth subacute, surface plane, and 

 recurved as usual. In the females the mental tooth is stouter, 

 more rounded at apex and the surface is plane. Variation: 

 tooth less recurved and distinctly truncate at apex. The lat- 

 eral marginal bead of the pronotum joins the basal bead in all 

 the specimens at hand. 



MEASUREMENTS: Smallest Male. Total length, 16.0 mm.; elytra, 9.8 

 mm. ; width, 4.8 mm. Pronotum. Length, 3.2 mm. ; width, 4.0 mm. 



Largest Male. Total length, 18.0 mm. ; elytra. 10.5 mm. ; width, 6.0 

 mm. Pronotum Length, 3.8 mm. ; width, 4.1 mm. 



Smallest Female. Total length, 19.0 mm.; elytra, n.o mm.; width. 

 5.5 mm. Pronotum Length, 3.5 mm. ; width, 4.5 mm. 



Largest Female. Total length, 21.0 mm.; elytra, 12.0 mm.; width, 

 6.1 mm. Pronotum Length, 4.0 mm.; width, 5.1 mm. 



The above measurements have been made from specimens, 

 selected from a series of twenty-two specimens that were col- 

 lected on the same one-fourth acre of land (Davis Meadow, 

 near Glencoe, Calaveras County, California) bordering a small 

 meadow and sparsely covered by bull-pines. They were living 

 absolutely under the same environment. Seven of the speci- 

 mens have no humeri, and fifteen specimens have broadly 

 rounded humeri. In the seven, the lateral elytral border passes 

 directly and obliquely backward from the elytral base. One 

 male has very nearly the form of augusto-cylindriciis, and the 

 elytra are just slightly wider than the pronotal base. The 

 seven without humeri are undeniably like inter me dius. Inter- 

 mediates connect the two extremes. Such are the variations 

 presented by a small series in which there can be no doubt of 

 specific identity. No mention is made of a similar series taken 

 two miles distant, for if the two series were mixed there might 



