70 PROCEEDINGS OF THE NATIONAL MUSEUM. voi.. 65. 



The genus Amhlychila includes three species, all of which are 

 limited in their distribution. The larvae are larger, fleshier, and 

 more grublike than the larvae of any of the other genera studied. 



DESCRIPTION OF SPECIES 

 AMBLYCHILA CYLINDRIFORMIS Say. 



Figs. 4, 10, 11. 1(>, 20, 26, 31, 30, 41, 81, 123, and 148. 



HuNGERFoRD and Williams, reared, larvae in the Department of Ento- 

 mology, University of Kansas. 



Color. — Head and pronotum dark chestnut brown ; setae brown. 



Head. — Setae on dorsal aspect of head long, slender, and promi- 

 nent ; ocellus 2 about one-half the size of ocellus 1 ; diameter of ocellus 

 2 subequal to the distance between ocelli 1 and 2 ; f ronto-clypeo-labral 

 area wider than long; transverse ridge on the caudal part of frons 

 with 6 to 8 setae; crenulate emarginations on the anterior edge 

 of the labrum subequal ; antenna with the second segment twice the 

 length of the proximal, three times the length of the third and ten 

 times that of the distal segment, setae long and slender, the proximal 

 segment with 6 to 12 setae and the second with 15 to 20 (fig. 126) ; 

 maxilla with the proximal segment of the galea bearing 5 or 6 

 setae on its mesal margin; ligula with six fine setae arranged in a 

 transverse row at its ventro-distal end, proximal segment of labial 

 palpus with 5 or 6 setae and the distal segment with 12 to 15 (fig. 

 20). 



Thorax. — Pronotum with the cephalo-lateral angles extending 

 cephalad of the mesal portion, lateral margins slightly carinate, 

 setae numerous, short, and conspicuous (fig. 81). 



Abdomen. — Chitinized areas indistinct; setae short to long, numer- 

 ous, and occurring between as well as uf)on the chitinized areas (fig. 

 123) ; median hooks with 18 to 20 setae; inner hooks with 12 to 15 

 setae (fig. 148). 



Measurements. — Length of larvae, 45 to 50 mm., width at the third 

 abdominal segment, 7 to 8 mm.; diameter of ocellus 1, 0.40 to 0.45 

 mm., of ocellus 2, 0.20 to 0.27 mm. ; distance between ocelli 1 and 2, 

 0.20 to 0.24 mm. ; length of f ronto-clypeo-labral area, 3.3 to 3.4 mm., 

 width, 3.6 to 3.8 mm.; length of pronotum, 4.2 to 4.8 mm., width, 

 6 to 6.4 mm. 



The habits of the larvae, as given by Williams and Hungerford 

 (1913), are as follows: 



They usually occur in colonies of from 2 to 11, the individual burrows being 

 close together, often not more than 1^^ inches apart. Usually a colony can 

 be circumscribed by a 10-inch radius. The larger ones (burrows) were a 

 little less than one-half inch in diameter and about 39 inches deep. The rim 

 was slightly elevated above the surface of surrounding level, and the entrance 



