6 MEMOIRS ON THE COLEOPTERA 



sometimes mingled with short feeble erect setse, which are never 



very conspicuous 4 



Legs slender, the tarsi conspicuously long 7 



4 Abdominal sutures arcuate. 5 



Abdominal sutures all perfectly straight from side to side 6 



5 First two abdominal sutures very fine, the last two strong. [Type 



Pedilophorus nitidus Schall.]. Palsearctic *Lamprobyrrhulus 



All abdominal sutures equally distinct, the abdominal sculpture always 

 more uniform and denser. [Type Byrrhus cerieus Fabr.]. Palae- 



arctic and nearctic Morychus 



6 Abdominal sutures equally distinct throughout, the ventral sculpture 

 uniform and very close-set; pubescence of the upper surface not 

 uniform as in all the preceding genera but condensed into streaks 

 and spots, the condensations independent of the distribution of the 

 punctures, the latter being uniform. [Type Pedilophorus subcanus 



Lee.]. Nearctic Tylicus 



7 Body very small in size, the under surface throughout very sparsely 

 punctate, the abdominal sutures equally distinct, arcuate; vestiture 

 of the upper surface consisting of long, erect and bristling hairs. 

 [Type Pedilophorus lariolosus Ferris]. Palsearctic. 



*Trichobyrrhulus 



8 Crural pits of the abdomen very deep, extending to and forming part 

 of the hind margin of the first segment for a considerable distance 

 at each side; first two sutures very fine, the last two coarse, nearly 

 as in Lamprobyrrhulus; abdominal punctures very coarse and fovei- 

 form, close-set; punctures of the upper surface irregularly aggregated 

 into denser spots and areas, wherein the generally polished surface 

 frequently becomes more or less chagrined. [Type L. fnrmosus 



n.sp.]. Nearctic Listemus 



Crural pits almost equally deep, their well defined transverse posterior 

 walls parallel with the hind margin of the first segment and at some 

 distance therefrom to the extreme sides of the abdomen, the ventral 

 surface rather finely and loosely punctured almost throughout, the 

 first two sutures nearly as distinct as the last two; body much 

 larger in size than in any other genus and with radically different 

 sculpture, the pronotum evenly and moderately punctate, the elytra 

 with even vittae of aggregated punctures, separated by equally 

 wide vitt?e in which the punctures are very minute and much sparser. 

 [Type Pedilophorus lecontci Wickh.]. Nearctic Eusomalia 



That the lack of elytral striation is a character of tribal importance 

 is shown by its constancy, no trace of striation ever being visible 

 even in Pedilophorus lecontei Wickh., where the perfectly even, 

 alternately metallic green, strongly punctured and brilliant coppery, 

 feebly punctured vittae are unaccompanied by the faintest sug- 

 gestion of striation.* Some species have an oblique spatuliform 



* The indistinct sulcation of the elytra mentioned by Wickham in describing his 

 Pedilophorus hesperus, I cannot understand, but presume that it is rather a corrugation 

 of the surface, perhaps accidental and in no way striiform in nature. 



