June-Oct., 1921 Bulletin of the Brooklyn Entomological Society 93 



fig. la) ; thorax longer as compared with first abdominal 

 segment 3. 



3. Pronotiim with a distinct transverse linear impression before 



middle (cf. fig. 2a) 4. 



Pronotum without the linear impression, often with one or two 

 transverse rows of punctures (^f , fig. la) 5. 



4. Abdomen ornamented dorsally with conspicuous patches of 



silvery pubescence; hind tibiae similar in male and female; 

 color dark brown, a transverse mark on anterior lobe of 

 pronotum and a spot on each connexival segment dull yel- 

 lowish; length about 2.3 mm americana Uhler. 



Abdomen without silvery pubescence ; hind tibiae bent in male ; 

 color black or brown with grayish markings more distinct 

 in female than in male; length about 1.8 mm. (fig. 2). 



borealis Torre-Bueno. 



5. Length about 2.3 mm. ; surface shining, very minutely pubes- 



cent; antennae very long and slender, the fourth segment 

 twice as long as distance between eyes ; color yellowish 

 brown, variably marked with black, .albonotata Champion. 

 Length less than 2 mm. ; pubescence more strongly developed, 

 though short, surface dull ; fourth antennal segment about 

 as long as distance between eyes 6. 



6. Pronotum about three times as long on median line as meso- 



notum; abdomen with conspicuous tufts of silvery pubes- 

 cence; third antennal segment slenderly clavate, slightly 

 longer than second (6-5) ; color black, anterior lobe of 

 pronotum yellowish, abdomen with dull grayish patches ; 



length about 1.7 mm buenoi Drake. 



Pronotum not twice as long as mesonotum; abdomen without 

 silvery pubescence; third antennal segment almost linear, 

 much longer than second (8-5) ; color light to dark brown, 

 with black, yellow, and bluish markings; length 1-1.6 

 mm hinei Drake. 



THE NUMBER OF ANTENNAL SEGMENTS IN GALL MIDGES 

 AND A NEW SPECIES. 



By E. p. Felt, State Entomologist of New York, Albany, N. Y. 



The normal number of antennal segments among generalized 

 Nematocera is probably 16 — that is, a greater or a smaller num- 

 ber means specialization by addition or reduction. The remark- 



