152 Twenty-fourth Report on the State Museum. 



Three days thereafter, the larva measures eight-tenths of an inch in 

 length. The head is dull ferruginous, with fuscous centrally and 

 laterally. Body of an umber-brown, lighter at the incisures, gray 

 dorsally with a dark vascular line ; segments with a few white hairs, 

 the longest of wliich surround the subdorsal spines ; horns of second, 

 third and eleventh segments curved, glossy black, with base luteous ; 

 spines dull- black. Anal shield marked with a cordiform, glossy 

 black spot, having central and marginal rufescent granulations ; anal 

 plates w^ith a subtriangular, granulated, fuscous impression. Stig- 

 mata surrounded with a dark brown ring. Legs shining black ; pro- 

 legs with a black spot exteriorly, and with fuscous near the plantse. 



Third molt — July 30th and August 3d, of the two larvse surviving 

 this change. Length, one inch. The head and color of the body are 

 as before. A n:iarked feature at this stage is the presence of long 

 white hairs given out. from the central portion of the segments, of 

 which the superior ones are nearly twice the length of the thoracic 

 horns, and the lateral ones shorter; similar hairs of medium length 

 project laterally over the proleg-bases. The horns are IS-lOOths 

 of an inch long, of a honey-yellow color, and are studded with 

 conical projections (of which the two apical are fuscous), bearing a 

 short, acute, fuscous spinule. The spines of the. two subdorsal rows 

 are o-lOOths of an inch long, of the color of the head, and (except the 

 two exterior to the horns) liave two fuscous, spinnle-tipped projec- 

 tions. The lateral row consists of tubercles, of which those on the 

 interior segments are simple, and on the terminal ones branched, of 

 a darker shade of color than the subdorsal spines. The substig- 

 matal row is composed of still smaller simple tubercles. Anal shield 

 brown with whitish granulations, bordered with tubercles, of which 

 two are branched ; anal plates fuscous centrally. Legs ferruginous ; 

 prologs fuscous on the outer side. 



Fourth molt of the sole survivor, August 16th. Length, one inch 

 and three-tenths. A marked change occurs in the horns at this 

 revolting. , From being heretofore cylindrical they are now conical, 

 are armed with stout spinules, and have become shorter ; the length 

 of the thoracic ones is 12-lOOths of an inch, of the posterior one, one- 

 tenth of an inch. The anal plates are conspicuously marked with 

 whitish granulations. The stigmata are brown, with a central line 

 and border of white, surrounded with fuscous on a subquadrangular 

 testaceous patch. 



On the 18th of Au^rust the larva died of diarrhoea- attended with 



