REHN AND HEBARD 237 



We give below in tabular form the extremes found in species 

 in tegminal and ovipositor length (in millimeters), and have also 

 stated the general form of the ovipositor and the results obtained 

 from counting the spines of the ventro-external margins of the 

 caudal femora. The normal counts for these spines give the 

 number for each limb individually, the extremes are based on 

 single limbs. 



Tegmina ^ • •, Spines of ventro- 



Macropterous Brachypterous "^''Po^'to'' external margins 



ot raudal femora 



lorigipes d' 15.. 3-20. 9 straight. normally 2 and 3. 



9 16.9-23.3 7.4-9.8" extremes 1 to 5. 



vitlicoUis o" 12.8-19.8 straight. none. 



? 14.6-20.7 7.6-10.2 



cinereus cf 20.9 ranging to 8'^ straight. normally 0. 



9 19.8 ranging to 9 7-11.2 U% 1 to 2 



f. fasciatus o^ 11.7-19,3 straight. normally 0. 



9 10-21 .1 7-9.9 13% 1 tO 3. 



/. idcin us d" 16.4-18.7 9 . 9-1 3 . 1 ^ ^ st raight . normally . 



9 15.6-18.5 10.6-13.9 7.5-13 4%ltj2. 



ictus d 15.2-19.9 6-9.3-0 straight. normally 2 and 3. 



9 19.1 4.8-10.1 9.3-13.9 14% 0. 



extremes to 7. 

 spinosus cf 14.3-21 .1 very weakly normally 3 and 4. 



9 16.2-22.8 curved, extremes 2 to 6. 



broader. 

 7-10.1 



insularis cf 18.6 ranging to -^ 9. 1 straight. normally and 1. 



9 19.3 ranging to 11.3 8.9-10.1 417o 0. 



extremes to 3. 



"^ Our measurements are taken from the base of the basal i)lica to the ai)ex 

 of the ovipositor. Redtenbacher gives 10.2 mm. for the maximum ovipositor 

 length of this species, measuring probably from the juncture of the subgenital 

 plate and ovipositor; this measurement is not constant, due to the mobility 

 of the subgenital plate, and would frequently exceed the dimension given by 

 us by about .4 mm. 



'5 In this species the intergradation between the extremes of the macrop- 

 terous and semi-macropterous condition is gradual, and mnnerons intermed- 

 iate specimens are before us. 



'^ No truly brachypterous form occurs in this geographic race, the material 

 treated in this column being more accuratelj' termed senii-maciopterous. 



-"Tegminal length of one intermediate male 11.4 mm., and of one inter- 

 mediate female 13.9 mm. This is the only American species known to us in 

 which intermediates are found, though rarely, between a strongly macrop- 

 terous and a strongly brachypterous condition. 



^' As in cinereus, the intergradation between the extremes of the macrop- 

 terous and semi-macropterous condition is gradual. 



TRANS. AM. ENT. SOC, XLI. 



