64 MAINE AGRICULTURAL EXPERIMENT STATION. 1917. 



The larvae of this species belong to the group popularly 

 known as horntails, on account of the long tail-like projections 

 from the caudal end of the body. Harpyia borealis has two of 

 these. The body is yellowish in color, the dorsal part nearly 

 all dark brown. They feed on wild cherry. The larvae are 

 found early in September and pupate about the last of the month. 

 The cocoon is very thick and tough and usually spun against 

 the side of the tree, where it resembles an excrescence on the 

 bark. 



Genus DATANA Walker. 



Body always with an elevation at the cephalic end between 

 the proximal ends of the antennae evidently to accommodate the 

 crest of the imago; front prominently elevated, the elevation 

 roughened with deep transverse striations and deeply punctate 

 along the lateral margins ; labrum also elevated, more promi- 

 nently on the cephalic half; mandibular area sometimes elevat- 

 ed; glazed eye-piece always very narrow, scarcely more than 

 a line along the mesal margin of the sculptured eye-piece; an- 

 tennae at proximal end wider than the prothoracic legs and tap- 

 ering gradually to a pointed tip, usually about two-thirds the 

 length of the wings; maxillae from one-half to three-fifths the 

 length of the wings, the proximo-lateral angles extending to the 

 eye-pieces; labial palpi entirely concealed; legs of the usual 

 length, the mesothoracic pair always meeting on the meson cau- 

 dad of the maxillae; wings always adjacent on the meson cau- 

 dad of the mesothoracic legs ; mesothorax shorter than usual 

 so that the thoracic segments are only one-fourth the total 

 length of the body ; mesal length of the prothorax one-half that 

 of the mesothorax, the metathorax about one-sixth of the same 

 length; thorax and abdomen always punctate; dorsum of abdo- 

 men always showing a deep furrow between segments nine and 

 ten, its caudal margin serrate; cremaster short, bifurcate, each 

 half bearing two or more short spinous projections. 



There are at least four species of D at ana found in Maine, 

 and two of these Datana ministra and Datana integerrima may 

 become serious pests. The other two species are comparatively 

 rare as far as our records for the state show. While the pupae 

 of this genus are very distinctive, the species are very closely 

 related and the characters available for their separation are 



