188 xt;\v YORK STATK MISKTM 



the wing margin at or a little below the apex; the cubitus is 

 forked; the R-M crossvein is at aliout the mid length of the wing; 

 the humeral n-ussvein is sometimes wanting. 



To the aliove description I may add that K. . is present though 

 usually quite delicate. The male genitalia consist of a dorsal 

 downward curved keel, a pair of elongate lateral lobes, a pair of 

 inferior ami a pair of superior IO!K-S i pl.:!L'. tig. 7 to 13) . 



KEY TO SPECIES OF CHIRONOMUS 



Larva< 



Tla- tooih on tin' middle lii t' a lahium having mi odd iminber of teeth 



will !M- r:illcd the middle or incdi:in Inotli. the lirst tooth laterad of this 

 will IK- called the !ir<t lateral: the <e.-oiid. Hie second lateral, and so on. 

 When there is aii e\eii unmix r of iceih. the lirst one laterad of the median 

 line will he called the lirst lateral: the se< -mid. the second lateral, etc. 



a Luhium with an odd nninher of teeth (i. e. center line bisects the middle 



tooth) 

 l> Middle tooth broadly truncate. pl.'Jl. tiu'.ls; pl.'J.",, fig.15 



C First lateral tooth smaller than the aecond, second truncaie, pi. 23, 



I i _.!." 59. ?pluinosus 



CC First lateral about same size as the third lt'. f 1 a v i c i n g u 1 a 



lib Middle tooth rounded 

 Middle tooth trilohed 



<l Teeth short, pl.23, fig.S GO. d e c o r u s n. sp. 



(Id Teeth lonjr. pl.2:!. fig.13 79. C h i r . sp. 



CC Middle tooth simple 



<I First and second lateral teeth rather closely united, pi. 21, fig.l 



Teeth as shown on pi. 21, fig.l 25. t e n e 1 1 u s 



- First and second laterals more distinctly separated than shown 



on this plate 48. dux n. sp. 



>1<1 First and second laterals as distinctly separated as the other 

 teeth 



Middle tooth shorter than the first laterals; blood red larva 



80. C h i r . sp. 



Middle tooth as long or longer than the laterals 



f Second and third laterals longer than the first laterals and 



closely united, pi. 37, fig.27 63a. t e n t a n s 



ff Not as above 



g Second laterals longer than the first and third 



h As shown on pl.23, fig.l GOa. d o r s a 1 i s 



1th As shown on pi. 37, fig.25 63. prasinus 



gg Teeth gradually becoming smaller from the median line 



towards the lateral margin 



h Teeth almost uniform in size, pl.22, fig.7. .81. C h i r . sp. 

 Jih Middle tooth distinctly larger 



i Middle tooth semicircular, pl.23, fig.3. .52. lobiferus 

 // Middle tooth hyperbolic, pl.22, fig.ll. .43. modestus 



