2 MEMOIRS ON THE COLEOPTERA 



includes in addition mimus Csy., humeroplanatus W. Horn and 

 oregonensis described below. The lecontei group contains in addi- 

 tion elongatus, dunni, regularis and maritimus Csy., and fuchsi W. 

 Horn, the last of which I have not seen and possibly may have re- 

 described under some one of the other names ; regularis may perhaps 

 be the same as lecontei, but it does not conform very well with the 

 description; I do not know the precise taxonomic status of the 

 various forms or of those attached to the following group. The 

 edwardsi group will comprise also montanus, lucidicollis , brunnescens 

 and lobatus Csy. The punctifrons group contains small forms, 

 of which also confluens, f rater culus and degener Csy., have been 

 defined. The sequoiarum group includes also lugubris Csy., with 

 subspecies sierricola defined below. The horni group includes 

 besides that species collaris and compositus Csy. The parvicollis 

 group includes also procerus Csy., and the one defined below under 

 the name spissipes. The intermedius group comprises in addition 

 cribripennis and blaisdelli Csy., one of which may be the true 

 intermedius, as I have not seen the type of that species. Finally, 

 the Icevis group includes tularensis Csy., of specific value, to which 

 is to be attached gracilior as a subspecies. 



Omus audouini ssp. parvulus nov. Similar to audouini but smaller, 

 anteriorly more slender and with shorter and more slender antennae, 

 the last palpal joint shorter; head and labrum similar, the front smoother, 

 with the sparse punctures more evident; prothorax similar in general 

 form and lateral convexity but with the vermiculate sculpture almost 

 completely obsolete laterally as well as medially; elytra nearly similar 

 but with rather closer and feebler sculpture, the foveae less evident, 

 tarsi more slender, the posterior much more notably exceeding the tibise 

 in length; copulatory spicule bent, flattened and rather broad apically. 

 Length (cf ) 13.0 mm.; width 4.5 mm. Oregon (locality not recorded). 



The relatively much longer hind tarsi, small size, more slender 

 form, shorter and more slender antennae and nearly smooth pro- 

 notum, are features which will render this form very easily identifi- 

 able among the allies of audouini. 



Omus oregonensis n. sp. Body in sculpture resembling mimus Csy., 

 but much shorter in form; head and labrum similar, the eyes not quite 

 so prominent; prothorax similar and deeply vermiculato-rugose through- 

 out but evidently wider than the head, and not subequal in width to the 

 latter as it is in mimus; elytra much shorter, evenly oval, widest at the 

 middle, the sculpture nearly similar but not quite so strong; legs not so 

 stout, the anterior femora much thinner; copulatory spicule apically 



