402 Coleojiterological Notices, V. 



TILEA Fauvel. 

 Phheopterus Mots. i. litt. ; Phlosopterus Csy., olim. 



This is the most conspicuous of the endemic North American 

 genera of Omalini, although probably occurring also in Siberia ; I 

 believe there is no record of its having been taken there, however. 

 The two species previously assigned by me to PhlcBopterus — an 

 erroneous quotation of Phlseopterus Mots. i. 1. — belong in reality 

 to Tilea, which has the fourth joint of the maxillary palpi, not one- 

 half longer than the third as stated in the original description, but 

 about twice as long as the third in the female, and often distinctly 

 longer, especially in the male. 



The sexes differ but very little in general appearance, the female 

 is however usually a little larger, relatively broader, and often with 

 the elj^tra distinctly longer, and the male has the anterior tarsi 

 slightly stouter toward base. The sixth ventral segment in the 

 male is more or less sinuately or arcuately truncate, but is longer 

 and parabolically rounded in the female. 



There are a number of distinct species of Tilea in North America, 

 all confined to the true Pacific fauna, which descends to some extent 

 also from the north along the crests of the Rocky Mountains indefi- 

 nitely to the southward. Of T. camcollis Fvl. I have examined 

 two specimens, one forming part apparently of the original lot from 

 Vancouver, and the other taken in the high sierras of California ; 

 it differs distinctly from longipalpus in its narrower form and in 

 thoracic structure. 



The seven species thus far discovered may be readily distin- 

 guished as follows: — 



Elytra long, always distinctly more than twice as long as the prothorax ; body 

 black or piceoiis-black. 



Femora paler toward base, 6.75 mm. Unalaska Island fiisconigra 



Femora not paler toward base. California to Vancouver. 

 Prothorax strongly transverse. 



Sides of the pronotum broadly, feebly reflexed behind the fovea but 

 only very narrowly and feebly declivo-subexplanate from the lateral 

 angles to the apex ; prothorax smaller when compared with the 



elytra — 9 cavicollis 



Sides of the pronotum deeply concave and strongly reflexed continu- 

 ously from the apical angles to the base, more broadly behind the 

 fovea ; form distinctly broader, the prothorax nearly as wide as the 

 elytra — J lOUgipalpus 



