300 NEW YORK STATE MUSEUM 



distad of the crossvein; both branches genth' bent downward 

 toward the hind margin of the wing; humeral crossvein more or 

 less distinct. Small species usually not exceeding 4 mm in length. 

 V. d. Wulp> loc cit. For a characterization of larva and pupa, see 

 M. knabi. 



KEY TO SPECIES OF METRIOCNEMTJS 



Imagines 

 a Yellowish species 



6 Abdomen brown with the incisures more or less yellow 



c Fore metatarsus about two thirds as long as its tibia; length 1 to 



1.33 mm 1. nanus 



CO Fore metatarsus about 0.8 as long as its tibia ; length 3 mm. 



2. f 1 a V i f r o n s n. sp. 

 6& Abdomen chiefly yellow 



c Large species 6 or 7 mm. in length ; thorax yellow with three brown- 

 ish sti'ipes, and yellow abdomen with brown spots 

 ' 3. p a r . utsp. 



CG Smaller species with abdomen nearly uniformly yellow 



d Species having wings only sparsely haired ; the posterior branch 

 of the cubitus suddenly deflected ; abdomen yellow ; length 2 to 

 3mm. (Greenland). (See Camptocladius gramini- 

 eola) 

 (Id Not as above 



e Rj^ short, ending far before the tip of the wing; halteres 

 white; length 1.25 to 1.75mm. (Greenland) 



4. debilipennis 

 ee 'R^■\■„ extends nearly to the tip of the wing ; halteres yellow 



5. lundbeckii nom. nov. 

 CO Grayish, brown, or blackish species 



6 Thorax with three blackish stripes ; ground color yellow ; scutellum 

 and metanotum black ; legs sordidly yellow or pale fuscous ; fore 

 metatarsus about two thirds as long as its tibia ; abdomen fuscous ; 



male ; length 2 mm 6. e x a g i t a n s n. sp. 



&6 Not as above 

 Legs yellow 



d Thorax gray with black stripes ; abdomen usually with whitish 

 incisures; fore metatarsus nearly as long as its tibia; louglh 



3 mm 7. incomptus 



dd Thorax with yellow ground color and blackish stripes ; abdomen 

 with posterior margins of segments yellow ; fore metatarsus 0.8 



as long as its tibia • -2. f 1 a v i f r o n s n. sp. 



oc Legs black or brown 



d Smaller species; length 1.5 to 2mm. 

 e Halteres black ; dull black, resembling Orth. stercora- 



r i u s 8. a t r a t u 1 u 8 



ee Halteres white; black ; metanotum somewhat polished 



11. knabi 



