300 NEW YORK STATE MUSEUM 



distad of the crossveiii; both branches gently 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. n a n u s 



cc 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. 

 66 Abdomen chiefly yellow 



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

 ish stripes, and yellow abdomen with brown spots 



3. par. n. sp. 

 cc 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- 

 cola) 

 dd Not as above 



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

 white ; length 1.25 to 1.75 mm. (Greenland) 



4. debilipennis 

 ee R 4 -f extends nearly to the tip of the wing ; halteres yellow 



5. lundbeckii nom. uov. 

 aa Grayish, brown, or blackish species 



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

 and metanoturn 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. 



66 Not as above 

 c Legs yellow 



d Thorax gray with black stripes ; abdomen usually with whitish 

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



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 2 mm. 

 e Halteres black ; dull black, resembling Orth. stereo ra- 



rius 8. atratulus 



ee Halteres white ; black ; metanotum somewhat polished 



11. knabi 



