32 DOXALDSON BODINE. 



jointed, not at the apex of the scape in the ordinary way, but is set 

 obliquely on the caudal edge of the apex. 



The CossiD.E. — The members of this family have well-developed 

 antenna?. The shaft is stout and strongly chitinized. The pectina- 

 tions are well developed in the males, and in some of the females. 

 The base is clothed with short, broad scales, with rounded or eniar- 

 ginate apices, and with numerous very narrow scales of greater 

 length scattered among the broader ones. On the clavola there are 

 very few scales, and these are confined to the dorsal aspect of the 

 shaft, and even there are quite closely applied to the surface. This 

 is doubtless correlated with the habit of swift flight of these insects, 

 and resembles in this respect the condition so characteristic of such 

 swift fliers as the Sphingidse. In the Cossidae, however, the insertion 

 of the scales is not so regular. The pectinations are well supplied 

 over their whole surface with sense-hairs of the third type. They 

 are more abundant, however, on the ventral aspect. The pectina- 

 tions arise from the ventral aspect of the shaft, but a curious devel- 

 opment in Zeuzera pyrini gives them the appearance of having 

 migrated dorsad as in some of the highly specialized forms. A 

 transverse, elevated, rounded ridge connects the bases of the pecti- 

 nations of each segment and causes them to appear as a single con- 

 tinuous growth, joined to the shaft at right-angles. Prioiioxystas 

 robiniae presents an unusual arrangement of depressions containing 

 sense-hairs. They lie just dorsad of the bases of the pectinations 

 and extend out for a certain distance upon them. There is a con- 

 siderable variability in this family in the supply of cones. Zeuzera 

 pyrini has as many as two on some of the segments, while Prio- 

 noxystus robini(e has only an occasional one. In none of the species 

 are the cones highly develo})ed. 



The EucLEiDyE. — The antenme of members of this family present 

 in some respects an unusual condition. Regarded as a whole, they 

 are as generalized as any of the Frenatai, but they possess cones which 

 show a considerable degree of development. The base is almost 

 entirely clothed with long, narrow scales mingled with many shoi'ter 

 and broader ones. In Euclea querceti every part of the surface is 

 covered. The clavola, also, is closely covered, except on the ventral 

 aspect, with broader scales, which, by their loose and irregular man- 

 ner of insertion, indicate a very low degree of specialization. In 

 Lymacodes Y-inversa even the ventral surface of the shaft bears 

 numerous scales. In the pectinate forms the pectinations are heavily 



