6 THE CANADIAN ENTOMOLOGIST. 



Vertex roundingly triangular, twice wider than long, two-thirds the 

 length of the pronotum, disc convex, rounding to front, apex bluntly 

 conical ; front broad and flat, width between antennae a little less than 

 three-fourth its length. Elytra long, the outer margins almost parallel, 

 their apices very broadly rounding. Venation strong, often accessory 

 cross nervures along clavus and between sectors of corium ; central ante- 

 apical cell very long, the posterior end angularly enlarged. 



Colour : ground colour a dirty straw-yellow ; vertex with a trans- 

 verse band just back of the ocelli, the ends of which do not reach the 

 eye, but curve forward to the front ; another interrupted band half way 

 between this and the posterior margin and two dashes curving away from 

 the apex and paralleling the other bands, black. Elytra with the 

 nervures white, the cells mostly filled with dark fuscous, omitting a 

 transverse, hyaline, band across the juncture of apical and anteapical 

 cells, a large milk-white patch on the cross nervures between the sectors, 

 a smaller one at the apex of each claval nervure and sometimes another 

 next to the claval suture. Face, dirty yellow arcs on front, especially on 

 upper half; sutures, spots around the antennal sockets and the disc of the 

 clypeus, fuscous. Male much darker than female, lower part of face and 

 below black. 



Genitalia : ultimate ventral segment of the female one-half longer 

 than penultimate, posterior margin nearly truncate, the median third 

 roundingly produced ; usually the segment is curved over the ovipositor 

 so that it appears emarginate, with a quite pronounced median lobe; male 

 valve less than half as long as its breadth at base, the apex rounding; 

 plates no wider than the valve, slightly concavely triangular, the apex 

 acute, two and one-half times the length of the valve, clothed with stout 

 white spines. 



Described from ten females and one male from Fort Collins, Colo. 



Readily distinguished from any other American species by the 

 genitalia and venation. There is a group of about six European species 

 that possess the same milk-white elytral markings, of which distinguendus 

 and Sche.nkii are similar in form, but none of them in venation and 



genital characters. 



Thamnotettix graecula, n. sp. 



Form of flavocapitata nearly, but stouter ; as large as Coquilletti, 

 which it somewhat resembles in colour. Length, $5.5 mm., $ 5 mm. 



