62 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



4. Triangular anteapical cell formed by outer fork of first sector 



before it joins costa, elytra greenish pallidus 



No anteapical cell formed by outer fork of first sector. Elytra 

 yellowish with iridescent tinge duzeei 



5. Large robust species with a band on vertex between the eyes, 



sometimes broken into an irregular row of spots or blotches.. . . 6 

 Smaller, two spots but no band present on vertex 7 



6. Pronotum light with dark markings on anterior half, elytra sub- 



hyaline with dark nervures lachrymalis 



Pronotum darker without definite markings, elytra rather opaque 

 with unicolorous or pale nervures scurra 



7. Spots on vertex small and about twice their diameter from the 



eyes 8 



Spots on vertex large and slightly more than their diameter from 

 the eyes 11 



8. Nervures of elytra usually alternating dark and white, without 



sutural stripe, pronotum and scutellum with markings 10 



Nervures of elytra not alternating in color, greenish with a dark 

 stripe along suture, pronotum unmarked snowi 



9. Male antennae without discs, color pale, a narrow brownish band 



across apex of clavus, and apices of elytra smoky cognatus 



Male antennae with discs, without definite band across apex of 

 clavus 10 



10. Dark colored, face with six longitudinal stripes, length 5 mm 



alternatus 

 Lighter, face pale without stripes, length 4.5 mm verticis 



11. Species pale with a pair of angular black spots on vertex, pro- 



notum and scutellum crataegi 



Dark, fulvous with light markings 12 



12. Clavus at base creamy yellow, elytra without dark coloration at 



center of costa provancheri 



Clavus fulvous, usually with a pale stripe, center of costal area 

 black fitchi 



I. alternatus Fitch. Idiocerus interrnptus Gillette and Baker. 



Homop. N. Y. St. Cab., 59, 185 1. 



Brov^nish fuscous with tv^^o black spots on the vertex, face 

 yellow with longitudinal dark stripes. Elytral nervures alternating 

 white and dark. Length 5 mm. 



Very common and abundant throughout New England on 

 willows. The adults hibernate and can be collected from early 

 spring to midsummer, and often in August. 



Cornwall, 5 June, 1921, Thompson, 19 July, 1921 (B. H. W.). 



I. cognatus Fieber. Idiocerus distinguendus Kirshbaum. 



Cicadinen von Mittel Europa, 162, 1896. 



A little larger than verticis which it closely resembles. Black 

 spots on vertex very small, sometimes lacking, but always very 

 prominent in nymphal stages. Pronotum smoky often with four 

 black spots on anterior margin. Scutellum with two round black 

 spots on disc. Elytra subhyaline, nervures alternating white and 

 brownish, a narrow band across apex of clavus and tips of elytra 

 brownish, iridescent. Male antennae without discs. Length 

 5 mm. 



