eouoDER.] CANADIAN FOSSIL INSECTS. 85 



what profusely punctate. It appears to approach L. di/oisum LeC, but 

 is a trifle larger, a little more densely and slightly more deeply punctured. 

 Length, 2-65°™; breadth, l-2°^. 



One specimen J No. 16883, Scarborough. 



Lathrobium frustum sp. nov. 

 PI. XL, Fig. 3. 



The last species of Lathrobium falls in the near vicinity of L. grande 

 LeC, and is represented by several elytra, which are about a third more 

 than twice as long as broad, of almost uniform breadth, bub scarcely 

 broadening posteriorly, the posterior margin truncate, the inner apical 

 angle reotangulate, the outer strongly rounded, with no margination of 

 the sutural border ; the surface is piceous, profusely and delicately 

 punctate. It agrees with the modern species mentioned in size, but the 

 posterior border is squarely and in no way obliquely truncate, and the 

 punctuation is more pronounced, slightly coarser and certainly deeper ; 

 nor is there any trace of castaneous in the coloring. Length 2.15 "^ ; 

 breadth O-Q"""- 



Seven specimens; Nos. 16884-16889, Scarborough; No. 16890, 

 Logan's brickyard, Toronto. 



L. grande is found from Nova Scotia to Lake Superior and North 

 •Carolina. 



Acidota crenata Fabr., var. nigra, var. nov. 

 PI. XII., Fig. 4. 



Staphylinus crenatus Fabr., Ent. Syst., I, pars 2, p. 525 (1792). 



A single left elytron, with puncta serially arranged, apparently repre- 

 sents the modern species A. crenata Fabr., but differs from it in that the 

 colouring is dead black instead of dark castaneous, which all the modern 

 specimens I have seen are, though they include some which LeConte 

 described under the specific name nigro-picea ; the punctures also seem a 

 little more pronounced, but the resemblance is so close that I do not 

 venture to separate it from the modern form by more than a varietal 

 distinction. Length, 2 •2"°'; breadth, I""'. 



One specimen : No. 16891, Scarborough. 



A. crenata occurs in Canada, Lake Superior, Michigan and Massachu- 

 .setts. 



Sc— 2J 



