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



often extremely short, with membrane very narrow and veinless, 

 or absent. In the male, the genital segment is large and thick, 

 bearing on each side a copulatory hook of form varying with the 

 species. (Fig. 153.) 



Key to Subgenera and Species. 



1. Body in large part shining black; head distinctly and obliquely 



narrowed behind eyes; front femora without spines; wing cell 

 with hamus arising from origin of decurrent vein (Subgenus 



Nabicula Kirby) ; length 9-10.5 mm subcoleoptratus 



Body wholly or in large part palHd or brown; head parallel or 

 nearly so behind eyes - 2 



2. Front femora with minute spines below; wing cell with hamus; 



connexivum more or less distinctly spotted; femora spotted, 

 annulate at apex; tibiae annulate (Subg. Hoplistoscelis Renter) ; 



length 6.4-7 mm sordidus 



Front femora without spines ; connexivum usually not spotted ... 3 



3. Femora with a subapical dark ring; wing cell without hamus; 



hind lobe of pronotum distinctly punctate (Subgenus Lasiomerus 



Renter) ; length 8-9.5 mm annulatus 



Femora without ring ; wing cell with hamus ; hind lobe of prono- 

 tum almost or quite impunctate 4 



4. Form elongate; short-winged forms with hemielytra less than 



three times length of scutellum; first antennal segment generally 

 about as long as head; hamus arising very near or at origin of 

 decurrent vein; long-winged forms extremely rare (Subgenus 



Dolichonahis Renter) 5 



Form broader, more or less ovate; short-winged forms usually 

 with much longer hemielytra ; first antennal segment generally 

 shorter than head ; hamus arising from the connecting vein ; 

 long-winged forms common as a rule (Subgenus Nahis Latreille) 6 



5. Form very narrow ; head about five times longer than wide 



between eyes ; hemielytra in short-winged form rounded at apex, 



membrane lacking ; length 9-12.5 mm propinquus 



Form broader; head about three times longer than wide between 

 eyes ; shortened hemielytra truncate at apex, membrane present ; 

 length 7.5-8.75 mm limbatus 



6. Hemielytra in long-winged form without three brown dots ; 



undeveloped hemielytra much shorter than abdomen; dorsal 

 surface of abdomen dark brown, margin of connexivum and single 



or double median stripe pale ; length 8-9 mm flavomarginatus 



Hemielytra in long-winged form with three brown dots, one on 

 disk of corium, two on membranal suture; undeveloped hemi- 

 elytra about as long as abdomen; dorsal surface of abdomen 

 without median stripes • • • 7 



7. First antennal segment very slightly longer than anteocular portion 



of head ; dorsal surface of abdomen black ; tibiae with black dots ; 

 copulatory hooks of male with large semicircular short-pointed 



blade and short stem {fide Renter) inscriptus 



First antennal segment much longer than anteocular portion of 

 head 8 



8. Color gray ; form narrow ; markings of posterior surface of front 



and middle femora tending to become a transverse striping ; tibiae 



immaculate 9 



Color reddish to dark brown; form broader; femora conspicuously 

 spotted, less tendency to striping 10 



9. Anterior femora extending beyond apex of head ; copulatory hooks 



of male with large semicircular blade and stem broadened basally; 

 length 6.5-8.5 mm ferns 



