264 LEPIDOPTERA OF NORTH AMERICA. 



hence cannot venture on making a more definite diagnosis than 

 that given above. Systematists have divided it, however, into a 

 number of groups, some of which may prove hereafter to be true 

 genera, and the subdivision will assist the student in recognizing 

 individuals. 



Group Isaiithrene. 



Isanthrene Huhner. Verz. Schmett. 125. 



Body cylindrical. Palpi rather long ; second joint rather short 



and slender. Antennae slightly pectinated beneath, serrated near 



the tips. Wings hyaline, more or less bordered with black, and 



in some species with a black band on the base of the disk. The 



disk emits five veins, discal fold distinct along the whole length. 



Abdomen linear. Legs rather stout ; median and apical spines of 



the hind tibia3 of moderate length. Especially distinguished by 



the cylindrical abdomen. 



Walker. 



1. G. chalciope BuhncT. Samml. Ex. Schmett. 23, 235, f. 469, 470. 



Blue Antennse luteous. Abdomen with lateral white dots. 



Wings limpid, margined with black. Fore wings with a black 



band. 



Havana. 



Walker. 



Group Poecilosoma. 



Poecilosoma Iluhner. V. S. 126. 



Body stout, convex, cylindrical, partly metallic. Antennae 



slender, minutely pectinated to the tips. Wings hyaline, metallic 



at the base ; fore wings with black tips ; discal fold distinct. 



Legs moderately stout ; median and apical spurs of the hind tibiae 



very small. 



Walker. 



1. G. multicincta Walker. C. B. M. 163. 



Male. Dark brown, linear, cylindrical, partly covered with blue 

 scales. Head with some while hairs above and thickly clothed 

 with white hairs beneath. Palpi white beneath, straight, rather 

 short; third joint very small. Antennas black, moderately, deeply 



