No. 34.] HEMIPTERA OF CONNECTICUT : CORIXIDAE. 387 



Asymmetry and strigil sinistral,* First tibia produced over pala in 

 the form of a spur Corixa, p. 390 



2. Metathoracic wings present and functional 3 



Metathoracic wings rudimentary Palmacorixa, p. 390 



3. Strigil absent Callicorixa, p. 390 



Strigil present, on the right side Arctocorisa, p. 387 



Arctocorisa Wallengren. 

 Key to Species. 



1. Length 8 mm. or more 2 



Length less than 8 mm 6 



2. Lineations tending to coalesce into solid color or longitudinal seria- 



tions 3 



Lineations distinct, often confused but always transverse and com- 

 pletely covering the corium 5 



3. Membrane with very obscure or no lineations 4 



Membrane with regular lineations somewhat like those of corium. 



Pronottun with 4-5 lines. Pegs 18 + 18 = 36. Margins of elytra 

 parallel ornata 



4. Length 8-9 mm. Markings heavy and often coalescent into solid 



black, which always covers iJie entire corium. Membrane smoky 

 but without true lineations, and in sharp contrast to the rest of 

 the tegmina. Corium bordered by yellow margin. Pegs 29-30. 

 Sides of body parallel. Pronotum with 6-7 narrow lines kennicottii 

 Markings coalescent, condensed to a mass of solid color in the 

 inner angle of the corium. Embolium and outer margin of 

 corium without lineations. Pronotum unicolorous or with 7-8 

 very narrow scratched lines. Pegs 22. Male pala, short ligulate. 

 Body broadest in the middle lucida 



5. Length 10-10.5 mm. Suture between corium and membrane rarely 



marked by color, — the lineations being continuous across the 



wings. Male pala ligulate . Pegs 26-30 interrupta 



Length 8-9 mm. Suture between corium and membrane usually 

 marked by a yellow line. Male palae shorter in proportion to 

 width than in interrupta. Pegs 21-24 nitida 



6. Lineations of clavus usually broad and entire, in contrast to the 



confused and broken lines of the corium. Length 6-8 mm 7 



Lineations of clavus, interrupted, of the same character as those of 

 corium. Length 4-5,5 mm 9 



7. Pegs 30 or less 8 



Pegs 38-40 in a single curving row, tegmina dark in color and very 



rastratef alternata 



8. Markings of coriimi coalescent into 3 longitudinal stripes. Pala 



with 21-23 pegs. Length 6 mm trilineata 



Corial markings confused and interrupted but not longitudinally 

 seriate. Pegs 29-30, Length 7-8 nun parshleyi 



9. Pegs more than 20, in a curved row 10 



Pegs 17 in an angulated row seriata 



10. Pegs 20-21 in an evenly curving row, midway the face of the pala 



compressa 

 Pegs 25-26, following the upper margin of the pala scabra 



A. interrupta (Say). (PI. xvi, 2.) 

 Jour. Acad. Nat. Soc. Phila., iv, 328, 1825. 



* Extending to the left, 



t With the surface roughened in ridges like a file. 



