234 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



by a variable number of undulating- transverse lines or shades; 

 usually more numerous on the secondaries. 



Expands, 1.48-1.80 inches = 37-45 mm. 



Habitat. — Canada to Southern Florida, west to the Mississippi and 

 probably to the Rocky Mountains. 



In the series before me all the specimens from the northern range 

 are in May. In a little series from Tryon, North Carolina, from the 

 Fiske collection (U. S. National Museum), dates are April 30, May 

 6, July 7, and August 9. 



The range of variation is chiefly in the amount of green powdering; 

 but there is also some difference in the ground, and occasionally there 

 will be an example that bears almost the same relation to the type 

 form that umbripennis does to undularis ; but the distinction does 

 not become so marked at any time and there is never any hesitation 

 as to where such a specimen belongs. 



The species has been referred as a variety of undularis; but it is 

 distinct throughout from that species, when close comparison is made. 

 The green powdering which is present in every example of aeruginosa 

 and never present in any undularis is sufficient for all ordinary pur- 

 poses. In addition, the shape of the reniform is altogether different, 

 the course of the s. t. line is characteristic in each species, and, finally, 

 the genitalic structure is decidedly unlike in both sexes. The spinula- 

 tion of the middle tibia is scant in both sexes and not easily found. 

 The sexual tufting on the middle femora of the male is conspicuous 

 and the mass of specialized scales is large. 



The male genitalia are markedly asymmetrical, the left harpe 

 formed into a much longer, narrow, curved process than the right, 

 which, broad for the greater portion of its course, is abruptly nar- 

 rowed to a slender bent process. 



The female genitalic structure is equally characteristic. Above, the 

 depressions on the last segment are rather conspicuously marked with 

 rusty yellow scales; beneath, the lobes are markedly dissimilar in 

 size, the right much the smaller, almost oval, and having the opening 

 to the copulatory pouch at almost the middle of the upper margin. 



The species seems to be less abundant than its near ally. 



PH-ffiOCYMA INSUDA, new species. 



Ground color dull leather brown, with smoky shadings, the female 

 much darker than the male. Front of the head white or yellowish, 

 limited above by a transverse black bar, which in turn is surmounted 

 by a white line limiting the concolorous vertex. Collar with a dusky 

 transverse line more or less obviously shaded by a paler tint on one 

 or both sides. Thorax crossed by two darker lines, more or less obvi- 

 ously margined posteriorly by paler scales. Basal space to the t. a. 

 line crossed by narrow brown and grayish lines, which ure more obvi- 



