132 



Eighteenth Report State Entomologist of Minnesota — 1920 



somewhat cleft at apex. In the male nymph the tip of the genital segment is 

 less S3-mmetrical, not cleft, the tip twisting slightly to one side and usually ex- 

 posing a small chitinous blade, evidently the beginning of the left genital clasper. 



Deraeocoris alnicola ne 



\v species 



General aspect very suggestive of borcalis but distinguished by the genital 

 claspers, prominent exserted hairs on antennae, and by paler infuscation of the 

 membrane which does not form a distinctly rounded spot on the apical half. 

 $. Length 6.5 mm. Head: width 1.08 mm., vertex .46 mm., length .57 

 mm. ; structurally as in boreaUs ; black, vertex, more or less each side of front, 

 sides on basal half of tylus, gula, genae except spot beneath antenna, bucculae, 

 lower margin of lorae, and narrow tip of tylus, pale to yellowish. Rostrum, 

 length 2.17 mm., reaching to near posterior margins of middle coxae, yel- 

 lowish brown, becoming piceous toward apex. 



Antennae: segment I, length .45 mm., black; II, 1.6 mm., black, pale on 

 the basal one-fifth, pale pubescent, exserted hairs long, some equal to three 

 times thickness of segment; III, .63 mm., blackish, paler at base; IV, .48 mm., 

 blackish. 



Pronotum: length 1.42 mm., width at base 2.28 mm., anterior angles .97 

 mm., collar .74 mm. ; calli black, invaded by pale at the antero-lateral angles 

 each side of a black lunate mark which extends to anterior angle of disk ; a 

 broad widening piceous or black ray behind each callus, usually extending to 

 basal margin of disk, the median line and basal margin narrowly, and the lateral 

 margins more broadly, pale ; propleura not so closely punctate as in borealis, 

 yellowish brown, blackish surrounding top of coxal cleft. Scutellum impunc- 

 tate, pale, a piceous vitta beginning at base and extending each side of median 

 line to near apex. Sternum opaque, brownish black, paler at median line and 

 margins ; pleura dark brownish, paler at margins, basalar plate yellowish ; 

 ostiolar peritreme pale, darkened with brownish above. 



Hemelytra : width 2.77 mm., structurally as in borealis but more broadly 

 piceous on corium and apical half of embolium. Cuneus pale, punctures evident 

 but blackish only at base, apex more broadly black than in borealis. Membrane 

 pale, the apical half infuscated but not heavily so, the infuscation not rounded 

 at sides but rather transverse at base, leaving an irregular transverse paler 

 streak across middle of membrane ; apical half of areoles and veins infuscated, 

 a distinctly darker mark paralleling the brachium at apex of larger areole. 



Legs : pale testaceous, apical half of femora blackish, forming two paler 



bands near apex ; tibiae triannulate with blackish, in pale forms the apices 



paler; tarsi, claws and arolia as in borealis. t/ ^ ■ u- ■ i 



K^n/^r: piceous, shmmg, pale 



yellowish pubescent ; genital 

 claspers (fig. 11) distinctive of 

 the species, the left clasper with 

 a prominent horn at base. 



9. Length 6.5 mm., width 

 2 9 mm. ; general coloration 

 similar to the male but slight- 

 ly paler, usually with less 

 piceous on the hemelytra, scu- 

 tellum. and front of head; seg- 



alnicola 



Fig. 11. Deraeocoris alnicola, male genital 

 claspers. a, left clasper, lateral aspect ; b, inter- 

 nal arm of left clasper ; c, right clasper, lateral 

 aspect. 



