6 BULLETIN 891, IT. S. DEPAETMENT OF AGRICULTURE. 



minute stiff hairs in transverse rows, becoming elongated toward the caudal 

 extremity. 



Second Stage. 



After the first molt the larva measures 15 to 17 mm. (| inch) long, and 4 

 to 5 mm. wide, or nearly three times the size of the newly-hatched larva. The 

 color has changed slightly, to light grayish, but apparently there is no other 

 change in general appearance. The head measures across the widest part 

 2.21 mm. 



Thied Stage. 



After the second molt the larva measures 28 mm. (over a full inch) in 

 length, and 6 to 7 mm. (fe inch) wide. The hairs on the dorsal surface 

 of the body are more prominent and bristle-like. 



The Fttll-Gkown Lakva. 



The larva, when full grown, measures from 45 to 48 mm. (2 inches) long 

 and 11 to 12 mm. (i inch) wide. Before transforming to the pupa the head 

 measures 4.14 mm. 



Full grown larva. — Length, 40 millimeters, somewhat largest posteriorly, 

 subcylindrical, broader at thorax and eighth and ninth abdominal segments, 

 which are materially swollen. More flattened ventrally, with a distinct 

 swollen lateral ridge just below the stigmata, which rather increases the 

 flattened aspect of the venter. General color, glassy yellowish white, inclin- 

 ing to green or blue toward the extremity. Head, rather small, flattened, well 

 inserted into the prothoracic segment, chestnut brown in color. Dorsal sur- 

 face of the body strongly transversely corrugate or wrinkled, each of the 

 chief segments having three distinct ridges, the whole body studded with short, 

 thick yellowish bristles, which are most dense on the dorsal ridges and more 

 sparse, but longer, on the ventral and anal segments. Dorsally these stiff 

 hairs are directed posteriorly and materially assist in the dorsal locomotion. 

 The legs are honey yellow, covered with similar stiff bristles without definite 

 tarsal claw. They are short compared with the larvre of Lachnosterna gen- 

 erally. Prothoracic segment with a honey yellow horny plate in front of the 

 spiracle, which, as usual, is rather larger than the abdominal spiracles. 

 Mandibles short, stout, dark brown, with the left (looking from the dorsum) 

 4-dentate and the right 3-dentate. Antennae short, 4-jointed, joints subequal 

 in length, diminishing in width, from 1 to 4. maxillary palpi, 3-jointed, joints 

 subequal in length, terminal narrowest at tip. Labial palpi, 2-jointed, joint 1 

 longest, somewhat swollen at tip and bearing a short pointed joint 2, on the 

 inner side of its tip. Labium covered with short stout bristles. Maxillae with 

 long, stiff bristles on the inner surface and with two long, sharp, black teeth 

 near the tip. 



The description of the full-grown larva is taken from Riley (20). 



THE PUPAL CELL. 



When the larva has attained full growth it transforms to the next 

 or pupal stage in a substantial oval cocoon or cell (PI. Ill, A ; PL IV) 

 constructed of earth composed of particles fastened together by a 

 viscid fluid excreted by the larva. At this time the larva loses consid- 

 erable size by the excretion of the fluid, a habit common to many 



