72 Studies on Life-hidory of Bumhycine Moths. 



Summary of the more salient ontogenetic features. 



1. But a single hair arises from a tubercle in stage I (D3'ar). 



2. Several hairs arise from a wart in stage II. 



3. The generic features begin to appear in stage III, since from 

 the third thoracic segment arise two subdorsal oblique distinct black 

 tufts ; and on the 8th abdominal segment is a black pencil. 



4. The abdominal segments 1-6 are provided in stage IV with 

 Avell-developed dorsal wedge-shaped tufts like those in the last stage. 



Note on H. harrisii Walsh. ^ 



This is the yellow variety of Halesidota tesseUata, with a honey- 

 yellow head and orange-colored pencils.^ 



Mature'^ larva. — This variety was found at Providence, R. I., 

 September 15, 1890, by the roadside on the carravvay. Length 18 mm. 



The head is honey-yellow, the anterior division of the clypeus, 

 with the labrum and antennte, whitish. The body is so densely 

 covered with uniformly 9\\kj-white hairs as to conceal it when at 

 rest. There are no hairs of any other color except the four anterior 

 dorsal pencils, which are of a rich ochre-orange huff color ; of these 

 the front pair arise from the 2d segment, and the hinder pair from 

 the 3d thoracic segment. There are two shorter lateral pairs of 

 white pencils, one in front arising from the 2d thoracic, and the 

 other from the 3d thoracic segment. 



From the 8th abdominal segment a pair of dorsal pencils of white 

 hairs project outward and backward, while a few long hairs project 

 back horizontally from the very end of the body. 



There is a pale chitinous broad and short prothoracic shield 

 divided into two halves by a pale line. 



The body is whitish, with a lateral row of large black patches 

 situated on each segment near the spiracles when the\' are present ; 

 the latter are ringed with black, and lower down is a row of large 

 irregular black patches at the base of the legs. The thoracic and 



' For interesting remarks and descriptions of the seven stages of this form 

 see Dyar (Psyche, VI, 162) ; in this paper Mr. Dyar regards H. harrisii as a 

 distinct species from H. tessellaris of Abbot and Smitli, as the larvae diifer in 

 their first as well as later stages, and he finds differences in the male genitalia. 



2 Proc. Bost. Soc. Nat. Hist., IX, 1864. Walsh does not mention the color 

 of the head in either of his two forms of tesscUatu. 



