36 Maine Agricultural Experiment Station. 1917. 



maxillae are always long, nearly always extending to the caudal 

 margin of the wings. The antennae vary little throughout the 

 family. They are usually about as wide as the prothoracic legs, 

 measuring the proximal part of both, and are gradually narrowed 

 to the distal end, which usually extends to the caudal margin 

 of the wings. The metathoracic wings usually extend along the 

 margin of the mesothoracic wings on the dorsal surface, but are 

 not visible in ventral view. The mesothorax is very short in 

 some genera and the entire thorax sometimes very short in 

 relation to the remainder of the body. The mesothoracic spir- 

 acles often have a decided projection adjacent to their caudal 

 margin. This may be a sharp ridge, or it may be a prominent 

 tubercle which is often flattened and bears numerous short setae. 

 The abdominal spiracles are sometimes produced and very often 

 the spiracles on the sixth segment are considerably ventrad of 

 the others. Spiracular furrows are frequently present, varying 

 greatly in size and number. The dorsal furrow between the 

 ninth and tenth abdominal segments is present in many genera. 

 It often bends caudad near the lateral margin of the body and 

 this lateral extension may reach to the base of the cremaster. 

 A cremaster of some type is always present. In the pupae ex- 

 amined during this investigation only two types were found, 

 the triangular type with hooked setae, and the bifurcate type, 

 with or without hooked setae. 



The coloring of the pupa varies considerably in this family. 

 While the majority are chestnut or darker brown, in common 

 with most lepidopterous pupae, there are some which are nearly 

 white, others yellowish, and various shades of yellowish and 

 reddish brown. Some are conspicuously marked with black 

 or dark brown and one of the pupae described has a beautiful 

 pearly luster. The genera described here may be separated as 

 follows : 



a. Cremaster with prominent hooked setae at the distal end, 

 but never bifurcate, 

 b. Cephalic end of body very blunt and each cephalo-lateral 

 angle prominently produced ; a large portion of the pro- 

 thoracic femur exposed. Cosymbia. 

 bb. Cephalic end of body rounded ; the prothoracic femur 

 never visible, or only a very narrow portion of it ex- 

 posed. 



