THE CANADIAN ENTOMOLOGIST. 



9S 



Dr. Dyar. — Generic Key. 

 Couplet 1. IMoiith brush vibratile, 

 diffusely folded inward. 



4. Air tube long [how long is a 

 piece of string?], the hairs in scat- 

 tered tufts or absent, the antennae 



, usually with the tuft beyond the 

 middle away from a notch. 



5. Anal segment without hairs be- 

 fore the barred area. 



6. Lateral comb of the eighth seg- 

 ment of many scales in a trian- 

 gular patch. 



Specific Key. 

 I. Antennae with the tufts out- 

 wardly placed, the part beyond 

 slender. 



5. Air tubes four times as long as 

 wide or over. 



7. Anal appendages 4, normal. 



8. Air tube with 4 paired tufts 

 posteriorly outwardly, s o m e - 

 times increased by additional 

 ones basally, the subapical one 

 moved laterad, out of line, 

 usually situated at the outer 

 third of the tube. 



14. Air tube less than five times as 

 long as wide, the sides curved, 

 tapering rather rapidly after the 

 middle, subfusiform. 



17. Air tube 5 x i [N.B. The tube 

 seems to grow between 14 and 

 17!], pecten teeth about 15, sub- 

 dorsal hairs of abdominal seg- 

 ments 3 and 4 double. 



10 



1 1 



17 



Mv Larva Key. 

 Tube well developed, tube-like. 

 Long thoracic tufts present. 



Chitin of head not produced 

 laterally, posterior portioji of 

 inajidible ?iever produced or visi- 

 ble from above. 



Anal gills never three times as 

 long as tube, never with more 

 than four distinct constrictions. 



Mouth brushes of slender hairs, 

 directed forward. Atitennce sit- 

 uated far forward. 



Tube with more than two tufts. 



18. Antennal tuft in notch and hav- 

 ing 10-30 hairs, usually over 75. 

 Pecten extending less than half 

 way up tube, not more than two 

 teeth separated. 



19. Body and head with no notice- 

 able pilosity. 



20. Scales of comb in more than 

 two rows. Tufts of tube not 

 plumose. 



22. Antennal tuft beyond middle, 

 tube with tufts. 



Group of hairs nearest meson 

 in thoracic row, one of three 

 lojig single hairs. Tufts of tube 

 mostly of two to four hairs. 



Tufts on tube 4, the penulti- 

 mate one more laterad, tul)e 

 tapering decidedly on the last 

 half. Terminal spines ofantennce 

 fiot very long, ?iot over one-half 

 length of ant en nee. Head tufts 

 not project i?ig much, if at all, 

 bey o?id forward margin of head. 



Tips of antefince and spines of 

 but slightly heavier chitiji thati 

 base of antennce. 



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