BULLETIN OF THE BROOKLYN ENT. SOO. 87 



Little attention has been paid to the sculpture of the pygidia 

 in general : a few smooth spots are on pygidium of Eleodes, one 

 on each side and one in the middle; one punctured spot on each 

 side of Tenebrio ; two excavations on each side in Boletotherns 

 etc. Very probably these marks are peculiar to species and not 

 to genus, which further investigations will show.— In living in- 

 dividuals of Tenebrionidse larvue the 4th antennal joint can be re- 

 tracted into the 3rd joint to some degree and after death there is 

 often only the tip of bristle visible sticking out of the 3rd joint. 

 Brief notes on pygidial differences. 



Unfortunately I had access to but a few Tenebriondae the gen- 

 eric differences of which I point to the following, thus enabling 

 the student to recognize the same. 



Blaps mortisaga, Fabr. Number of articulated spines usu 

 ally 12 lateral and 2 latero-terminal. Out of 10 individuals 1 

 had 2 with 16 in all, rest only 14. 



Eleodes gigantea, Mann, and E. dentipes, Esch. Number 

 of articulated spines usually 16 lateral and 2 latero-terminal. A 

 number of either species (gig- and dent.) had only 16 in all. One 

 individual had two articulated spines in one aperture, one had 

 them assymetrically placed, nine on one and eight on the other 

 side. 



Gnathocerus cornutus, Fair. Tip minute ; two compara- 

 tively long acinaciform processes a little behind the middle on 

 each side, (length of larva. 8 mm.) 



Piatydema excavatum, Say. Four longer and four shorter 

 articulated spines, tip very small, fiat and cut off. 

 Tenebrionsllus tenebrioldes, Beawo. Nearly entire pygidi- 

 um irregularly covered with articulated spines of three different 

 lengths ; tip round. 



Xyiopimis saperdioides, Oliv. Pygidium deeply punctur- 

 ed ; two slightly diverging terminal, gradually turned-up hooks 

 and one very minute articulated spine on each side at base of 

 hooks. 



Tenebrio ofoscurus, Fabr. Pygidium with -median longitu- 

 dinal groove, one lateral punctured notch and two terminal, small, 

 suddenly turned-up hooks. Pygidium cordiform and compara- 

 tively small. Two minute articulated spines on each side a little 

 behind the middle. Pygidial base very convex. 



Boleiotherus cornutus, Fabr. Pygidium without terminal 



