JN0.2242. MORPHOLOOY OF THE STREPSIPTERA—PIERCE. 437 



22. Base of head 0.57 as wide as ceplialothorax at spiracles ; base of cepha- 



lothorax 0.69 breadth at spiracles ; length of cephalothorax 1.08 

 breadth at spiracles (Neostylops, group 2) solidulae. 



23. (a) Mandibles with apical tooth or sharp angle, but without lateral angle_ 24 

 (&) Mandibles with apical tooth and an angle on lateral margins 29 



24. (a) Cephalothorax broader than long or exactly as long as broad; base of 



head 0.59 as broad as cephalothorax at spiracles 25 



(h). Cephalothorax longer than brond 26 



25. (o) Mandibles broadly rounded, toothed near inner apical angles ; breadth at 



base of mandibles 0.40 as broad as cephalothorax at spiracles; 

 base of cephalothorax 0.77 breadth at spiracles (Stylops, group 

 12) sinuatus. 



(b) Mandibles subquadrate with apical tooth pointed outward; breadth at 



base of mandibles 0.31 as broad as cephalothorax at spiracles ; 

 base of cephalothorax 0.73 breadth at spiracles (Stylops, group 

 12) grandior. 



(c) Mandibles narrowly rounded, toothed at apex; breadth at base of 



mandibles 0.36 as broad as cephalothorax at spiracles ; base of 

 cephalothorax 0.74 breadth at spiracles {Stylops, group 12) midae. 



26. (a) Mandibles merely angulate at apex; breadth of head 0.67 as wide as 



cephalothorax at spiracles ; breadth of cephalothorax at base 0.83 

 breadth at spiracles ; length of cephalothorax 1.07 breadth at spiracles 



(Stylops, group 13) salicifloris. 



(h) Mandibles distinctly toothed at apex 27 



27. (a) Mandibles subquadrate with outward pointing tooth 28 



(b) Mandibles rounded with apical tooth; base of head 0.52 to 0.56 as wide 



as cephalothorax at spiracles ; base of cephalothorax 0.69 breadth 

 at spiracles (Stylops, group 12) cornii. 



28. (a) Base of head 0.60 to 0.63 as wide as cephalothorax at spiracles; dis- 



tance from spiracles to apex 0.64 to 0.68 breadth at spiracles (Stylops, 



group 12) calif ornica. 



(b) Base of head 0.57 to 0.64 as wide as cephalothoi-ax at spiracles; dis- 

 tance from spiracles to apex 0.69 to 0.74 breadth at spiracles (Stylops, 

 group 12) vicinae. 



29. (a) Cephalothorax broader than long; breadth of head 0.53 as wide as 



cephalothorax at spiracles; of cephalothorax 0.69 breadth at spira- 

 cles; length of cephalothorax 0.92 breadth at spiracles (Stylops, 



group 14) graenicheri. 



(b) Cephalothorax longer than broad 30. 



30. (a) Breadth of head 0.53 as wide as cephalothorax at spiracles; base of 



cephalothorax 0.83 breadth at spiracles ; length of cephalothorax 1.04 

 breadth at spiracles (Stylops, group 15) cressoni. 



(b) Breadth of head 0.56 as wide as cephalothorax at spiracles; base of 



cephalothorax 0.77 breadth at spiracles ; length of cephalothorax 1.04 

 breadth at spiracles (Stylops, group 15) diabola. 



(c) Breadth of head 0.60 as wide as cephalothorax at spiracles; base of 



cephalothorax 0.86 breadth at spiracles ; length of cephalothorax 1.06 

 breadth at spiracles (Stylops, group 16) Uartfordcnsis. 



(d) Breadth of head 0.61 as wide as cephalothorax at .spiracles; base of 



cephalothorax 0.71 breadth at spiracles ; length of cephalothorax 1.04 

 breadth at spiracles (Stylops, group 16) neonanae. 



