THE LAMELLICORN BEHTLES. 



ter in the form of a rounded lobe; base rather acutely lobed at middle; disk 

 with four elongate tubercles along the basal margin, the outer one each side 

 with a smaller one in front; the median pair each with a Y-shaped ridge 

 in front, these ridges forming the sides of a median groove. Elytra with 

 rows of moderately elevated, oblong, tubercles, tomentose at summit ; be- 

 tween the rows of large tubercles is a row of smaller ones, also tomentose 

 at top, and on each side of the smaller tubercles is a row of rounded granu- 

 lar elevations; the surface between all tubercles and elevations, smooth. 

 Length 15-18 mm. 



Lake County; rare. September 3. I have seen but a single 

 specimen, taken by J. D. Hood on the beach of Lake Michigan, 

 near Pine. It occurs on the sandy shores of lakes and rivers and is 

 said to be abundant in the Gulf States. The rows of three different 

 sizes of tubercles on the elytra readily distinguish this from our 

 other large species. 



1778 (5014). TROX MONACHUS Herbst., Kafer, TIT, 1789, 25. 



More oblong and less robust 

 than srabrusus. Dark brown or fus- 

 cous. Thorax with sides subangu- 

 late in front of notch near hind an- 

 gles ; basal margin deeply sinuate 

 near the angles; tubercles as in 

 Nnilirosus. Elytra each with five 

 rows of rounded or oval tubercles, , 



rig. *>8. a, larva; b, pupa; r, beetle; d, e, }, Ie?, cervical 

 tomentose at tip, rather distantly plate and maxilla of larva. (After Riley.) 



placed one from another, those of 



one row alternating with those of the next ; the spaces between the tuber- 

 cles finely and sparsely granulate, one of the tubercles of third row 7 on 

 apical fourth of elytra is much enlarged, the corresponding one in the 

 fourth and fifth row also enlarged, but smaller than that of the third. 

 Length 13-16 mm. (Fig. 368.) 



Southern half of State; frequent. June 7-October 6. 

 on the former date. 



Mating 



1779 (5615). TROX ASPER Lee., Proc. Phil. Acad. Nat. Sci., VII, 1854, 215. 



Oblong, robust. Purplish or grayish-brown ; the first joint of antemw 

 and club as in moiiaehus. Thorax as in moiiachus, except that the notch 

 near hind angles is less deep, the angular lobe less prominent, and the 

 sinuation of basal margin less marked. Elytra with rows of oblong or 

 elongate, tomentose tubercles, their front ends smooth and shining. Inter- 

 vals between the larger rows of tubercles each with a row of small ones, 

 on each side of which is a row of rather deeply impressed punctures. 

 Length 13-15 mm. 



Putnam County; rare. June 11. Probably occurs sparingly 

 throughout the southern half of State. 

 [00234021 



