396 CALIFORNIA ACADEMY OF SCIENCES. 



There are at present a number of genera with a more 

 or less membranous and free hgula associated with vari- 

 ous tribes of Melolonthidas, such as Ph3dlotocus, the 

 Pachytrichides, Aclopides and Chasmatopterides, which 

 might form groups between the Laparosticti and Pleuro- 

 sticti, as at present arranged, and thereby render the 

 transition less abrupt. The Pachycnemides occupy just 

 such a position as placed by Lacordaire. The Chasma- 

 topterides and Aclopides are true laparosticts, while 

 Pachytrichia seems far better placed near Glaphyrus, as 

 Hope, Burmeister and Westwood have suggested. Phyl- 

 lotocus, a laparostict, is about as badly placed among the 

 Sericides. 



Some interesting results will follow a study of the 

 Pach3"podides. In Pachj^pus the spiracles are so placed 

 as to make it doubtful whether they are truly laparostict 

 or not. The entire organization of Pachypus seems to 

 relate it to our Pleocoma, an undoubted laparostict, except 

 as to the ligula. The larva of Pachypus is badly needed 

 to settle its true position in the lamellicorn series. 



DiCHELONYCHA PICEA n. Sp. 



Brownish piceous varying to quite pale, without metal- 

 lic lustre, sparsely clothed with short semi-erect gray 

 hair. Head rather coarsely, moderately closely punc- 

 tate. Clypeus nearly smooth, arcuate in front, angles 

 obtuse, sides oblique continuous with the gence, the eyes 

 not prominent, frontal suture distinct, not impressed. 

 Antenna? 8-jointed. Thorax nearly twice as wide as 

 long, sides rather strongly arcuate, all the angles very 

 obtuse, disc convex without sulcus sparsely punctate es- 

 pecially at middle, a fovea near the middle of each side. 

 Elytra vaguely costate, coarsely and irregularly punctate. 

 Body beneath very sparsely punctate and hairy. Legs 

 somewhat pale. Length, .30 inch; 7.5 mm. 



