68' PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65. 



five-eighths the length of the median hooks and with two setae; 

 median hooks with two setae; lateral hooks with six to eight setae. 



Measurements. — Length of larvae, 26 to 28 mm., width at the 

 third abdominal segment, 3.2 to 3.4 mm. ; diameter of ocellus 1, 0.50 

 to 0.52 mm., of ocellus 2, 0.30 to 0,32 mm.; distance between ocelli 

 1 and 2, 0.30 to 0.32 mm.; length of fronto-clypeo-labral area, 2.6 

 to 2.8 mm., width, 2.3 to 2.5 mm.; length of pronotum, 2.7 to 2.9 mm., 

 width, 4.7 to 5 mm. 



The larvae were collected at Shasta Retreat, Siskiyou County, Cali- 

 fornia, July 31, 1905, by Dr. F. E. Blaisdell, sr., and Beverly 

 Letcher. 



OMUS SEQUOIARUM Crotch. 



Figs, -if), S"), tind 120. 



Blaisdell, reared, larvae in the collection of Dr. A. D. MacGillivray, Uni- 

 versity of Illinois. 



C6»Zor.-— Head dark bronze or black and uniformly colored; pro- 

 notum dark chestnut brown with lighter areas ; setae on dorsal aspect 

 of head and pronotum the same color as the head, the other setae 

 light brown. 



Head. — Setae on dorsal aspect long, stout, and prominent; diameter 

 of ocellus 2 slightly greater than the distance between ocelli 1 and 

 2; fronto-clypeo-labral area wider than long; transverse ridge on 

 caudal part of frons bearing five setae, the median seta much larger 

 than those on each side; cephalic margin of the labrum with tlie 

 crenulate emarginations shallow, the median lobe not distinctly 

 wider than those on each side (fig. 45) ; antenna with the proximal 

 segment as long as the second, the third slightly less than the length 

 of the second, and the distal slightly more than one-half the length 

 of the second, the proximal segment with four or five setae and the 

 second with five or six; maxilla with the proximal segment of the 

 galea bearing three setae on its mesal margin; ligula with four fine 

 setae arranged in a transverse row at its ventro-distal end, proximal 

 segment of labial palpus with a single spine-like projection on its 

 ventro-distal margin and with a single seta on each side of this 

 spine, the proximal segment with two setae and the distal segment 

 with one. 



Thorax. — Pronotum with the cephalo-lateral angles extending 

 almost as far cephalad as the mesal portion, lateral margins slightly 

 carinate, setae not more than fifty in number (fig. 85). 



Abdomen. — Chitinized areos distinct; secondary setae prominent 

 and numerous, tergal sclerites with three large, adjacent setae on 

 the lateral margins (fig. 120) : ninth abdominal sternum with the 

 caudal margin bearing two groups of four setae each; inner hooks 



