300 NEW YORK STATE MUSEUM 



distad of the crossvein; botli 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 METRIOCNEMUS 



Imagines 

 a Yellowish species 



J) Abdomen browu with the incisures more or less yellow 

 G 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. 

 && Abdomen chiefly yellow 



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

 ish stripes, and yellow abdomen with brown spots 



3. p a r . 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 

 3 mm. (Greenland). (See Camptocladius g rami ni- 

 ce 1 a) 

 dd Not as above 



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

 white; length 1.25 to 1.75mm. (Greenland) 



4. d e b i 1 i p e n n i s 

 ee R^^-, extends nearly to the tip of the wing ; halteres yellow 



5. lundbeckii nom. nov. 

 aa Grayish, brown, or blackish species 



& 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 G. e x a g i t a n s n. sp. 



hh 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 O.S 



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



00 Legs black or brown 



d Smaller species; length 1.5 to 2mm. 

 e Halteres black ; dull black, resembling O r t h . s t e r c o r a - 



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



ee Halteres white ; black ; metanotum somewhat polished 



• 11. knabi 



