I04 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



A common form in New England, often occurring in boggy 

 places on blueberry during August and September. 



New Haven, 22 Sept., 1918 (F. H. L.) ; 16, 20 June, 20 July, 22 Sept., 

 1920 (B. H. W.) ; East Hartford, 16 Sept., 1920 (B. H. W.) ; Hamden, 23 

 Oct., 1921 (B. H. W.) ; North Haven, 4 Sept., 1921 (B. H. W.). 



Deltocephalus Burmeister. 



Vertex more or less obtusely triangular, often strongly pro- 

 duced, head, including eyes, wider than pronotum. As a rule 

 there are two distinct cross veins between the first and second 

 sectors. 



At the present time this genus contains a great number of 

 American species which vary greatly in structural characters, and 

 are consequently very hard to characterize as a group. 



A large number of the most injurious forms of the entire family 

 belong to this genus and feed usually upon grasses, cereal and 

 forage crops. Especially abundant in meadows, old pastures and 

 fields of grain. 



Though commonly double-brooded, some species have only one 

 generation each season. Field observations and collecting records 

 seem to indicate that in a few species a partial second generation 

 may occur. 



Key to Species. 



1. Elytra with two outer apical veinlets reflexed to costa, these together 



with the previous one pale, dark margined. Appendix wanting. 



(Fig. II, 5.) 2 



Elytra without reflexed apical veinlets, appendix present although 

 often very small S 



2. Vertex produced, decidedly longer than width between eyes, defi- 



nitely marked with black or dark fuscous. (Fig. 11, i.) 3 



Vertex as wide as long, yellowish hyaline with few dark markings 



infiatus 



3. Elytra with pale nervures, rather broadly and heavily margined 



with dark fuscous 4 



Color bright yellow, nervures somewhat indistinct, a large round 

 black spot on disc of each elytron, almost filling discal cell, and 

 reflexed veins broadly margined with fuscous areolatus 



4. Head very strongly produced but rounded at tip, female segment 



with rounded median lobe, male plates long and with pointed diver- 

 gent tips sandersi 



Form appearing more robust, vertex broader and shorter, female 

 segment with a central produced, somewhat keeled portion, male 

 plates shorter than combined width, tips bluntly rounded pictus 



5. Elytra with outer clavus often with one, but seldom with two, 



reticulate veins; vertex usually rather long, disc flat. (Fig. 



II, 3d.) ; ; 6 



Elytra with outer clavus strongly reticulate, with two, and usually 

 several, reticulate veins ; vertex short, disc convex, apex blunt. 

 (Fig. II, 4b.) 9 



6. Elytra with only a suggestion of an appendix, pronotum short with 



posterior angles broadly rounded 7 



Elytra with distinct appendix, usually large, pronotum proportion- 

 ately longer, posterior angles more prominent 15 



