300 NEW YORK STATE MUSEUM 



distad of the crossvein; 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 



& 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 n s n. sp. 

 th 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 Oamptocladius gramini- 

 cola) 

 dd Not as above 



e R^-fs short, ending far before the tip of the wing; halteres 

 white; length 1.25 to 1.75mm. (Greenland) 



4. debilipennis 

 ee Ri^-a extends nearly to the tip of the wing ; halteres yellow 



5. lundbeckii nom. nov, 

 aa 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. 



ft& Not as above 

 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. 

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



rius 8. atratulus 



ee Halteres white ; blacli ; metanotum somewhat polished 



11. knabi 



