42 Journal New York Entomological Society, [^oi. xxx, 



cell ; also in having the opercula more evenly rounded at the extremities in- 

 stead of truncated obliquely as in that species. From Tibicen zuinnemanna 

 it differs in being smaller, in having the opercula more evenly rounded at the 

 extremities, the outer margins not as converging toward the extremities, and, 

 as in linnei, not as obliquely truncated on the inner side. These differences 

 also hold with reference to typical pruinosa, which differs further in lacking 

 the shining black median band beneath on the abdomen, so sharply defined 

 in robinsoniana. 



Head with a broad black stripe between the eyes including the area of 

 the ocelli ; supra-antennal plates, and frontal triangular spot between the 

 black transverse rugae, green ; antennae black. The pronotum is black, with a 

 central, oblong, triangular", green spot, each side of which are large irregular 

 blotches of green or brownish-green ; the hind margin of the collar is also 

 green (fore margin partly black), the green extending to the sides, where it 

 is usually interrupted by black close to the base of the fore wings. The 

 mesonotum is marked with green or greenish-brown as in linnei, pruinosa var. 

 winnemanna, and pruinosa var. latifasciata. The tergum is shining black 

 resembling in this respect linnei and pruinosa var. latifasciata. There is no 

 white stripe at the base of segment three, only a pruinose spot each side at 

 the base of the abdomen, sometimes extended into a transverse pruinose line. 

 There is a pruinose spot each side on the caudal segment, as in linnei, prui- 

 nosa and some other allied species. Beneath pruinose with the transverse 

 rugas black or brownish-black, and a well-defined, central, shining black stripe 

 extending the length of the abdomen ; valve also black, usually margined with 

 pale along the upper edges. Legs greenish variegated with black ; opercula 

 pale. The venation of both pairs of wings is as in linnei; the first and second 

 transverse veins of the fore wings are clouded; the first two or three marginal 

 cells are slightly smoky and the membranes at the base of both pair of wings 

 are dark gray, those' of the hind wings edged with white. The female is 

 colored as in the male, except that the basal pruinose spots of the abdomen 

 may be absent. 



Me.\surements in Millimeters. 



Female 

 Male Type. Allotype. 



Length of body 33 32 



Width of head across eyes 13.5 13.5 



Expanse of fore wings 90 90 



Length of operculum 7 



In addition to the type and allotype the following thirty-four speci- 

 mens were secured at Wingina, all of them collected with a shotgun: 

 August 3, two males ; August 4, ten males ; August 7, eight males ; 

 August 8, one male; August 9, one male; August 12, six males; Au- 



