100 



NORTH AMERICAN MYRMECOPHILA (oRTHOPTERA) 



The convergence shown by manni and nebrascensis in Arizona 

 causes material from that region to be separated with consider- 

 ah\e difficuIt3^ We find that occasional individuals of the present 

 species from Arizona, particularly among the smaller examples, 

 have the third spine of the dorso-internal margins of the caudal 

 tibiae greatly reduced, rarely missing on one or both limbs. As 

 Arizonan specimens of nebrascensis are almost always very pale 

 and unifoi-m in coloration, not showing the barred type which is 

 more usual in material of that species from Nebraska and Texas, 

 the only difference which can be determined, in such specimens 

 as descril)ed above, is that of the caudal metatarsal armament, 

 showing dorsad three spines in manni, two in nebrascensis. 



The present species shows decided size variation, but by no 

 means as great as is shown by the larger series of oregonensis 

 before us. 



Measurements (in millimelers) 



Length 



Length Width Length Width of 



cf of of of of caudal 



body body caudal caudal meta- 



femur femur''' tarsus 



Wawawai, Wa.shinsti)n,/«/w/.v/w' 2.4 l..^ 1.41 .88 (X 1.64—) .748 



Wawawai, Washington, /o/w///pe 2.5 1.7 1.57 .95(X1.64— ) .884 



Pyramid Laive, Nevada 2.38 1.3 



San Ysidro, California 2.86 1.84 1.72 1.16(X1.48 + ) 



Oracle, Arizona 2..58 1.97 1.7 1.09 (XI. 56— ) 1.02 



Santa Rita Mts., Arizona 2.86 1.84 ■ 1.02 



Huarhnoa Mts., Arizona 3.06 1.77 1.5 .95 (XI. 58— ) .85 



Length 

 Q of 



ovi- 

 positor 



Wawawai, Washington, ^opo/(//;e 2..58 1.56 1.36 .88 (X 1.55—) 1.09 



Pyramid Lake, Nevada 2.52 1.5 1.36 



Pahn Springs, Cahfornia 1.97 1.25 1.09 .76 (X 1.43 + ) 1 



San Ysidro, Cahfornia 2. ,52 1.77 1.52 .99 (XI. 54 ) 1.22 



WilHams, Arizona 2.58 1.43 .88 1.04 



Oraele, Arizona 2.72 1.84 1.6 1 (Xl.6) .88 



Santa Rita Mts., Arizona 3.33 2.31 1.8 1.09(X1.65 + ) 1.5 



Iluafhiica Mts., Arizona 2.86 1.97 1.73 1.16 (X1.49 + ) 1.3 



It would appear that geographic factors have little or no 

 influence on t he size in //mn/;/, the variation shown being attril)ut- 

 able to iiKJividual variation and some corn^latioii with the size of 

 the ants forming the host colony. 



" XimilxT or times widtli of caiuhd iVmin- is contained in its \v\vA\\. 



