96 NORTH AMERICAN MYRMECOPHILA (oRTHOPTERA) 



Mynnecophila nebrascensis. Lugger 



Pnchycondyla harpax Pogonomyrmex barbatus 



Pheidolc vas'Hi Liometopimi apiculaium 



Pheidolc desertorum Dorymyrmex pyramicus 



Crematogasler lincolata Iridomyrmex pruinosus 



Formica riifibarbis 



Key for the North. A mericnn Species of Mynnecophila 



A. Dorso-iiitern:il margin of caudal tibia armed (normally, rarely in manni 

 is one s])inc missing) with four spines, alternating in length. Dorsal 

 surface of (!audal metatarsus armed along the median line with three 

 minute spinulae. 

 H. General coloration dark brown, in recessive examples yellowish brown. 

 Abdominal segments never appearing banded. Dorso-external spine 

 of caudal tibia as long as or longer than half the length of the tarsal 

 joints. 

 C. Generic pronotal spots faintly outlined in a paler coloration. Caudal 

 metatarsal spurs usually as long as terminal tarsal joint. Dis- 

 tribution: Atlantic Coast from Maryland southward, westward 



to Nebraska pergandei Bruner 



CC. Generic pronotal spots of general coloration. Caudal metatarsal 

 spurs usually .slightly longer than terminal tarsal joint. Distribu- 

 tion: Pacific Coast from Vancouver Island to the Mexican Border, 

 eastward throughout the Cascades, Sierras and mountains of south- 



(>rn C'alifornia, but not east of them oregonensis Bruner 



BB. General ('oloration pale yellowish brown. Abdominal segments some- 

 times margined caudad with a slightly darker shade, giving such 

 individuals a banded appearance. Dorso-external spine of caudal 

 tibia often distinctly less than half the length of the tarsal joints. 

 (Generic pronotal spots of general coloration. Caudal metatarsal 

 spurs usually slightly longer than terminal tarsal joint.) Distribution: 

 Southeastern Washington to Mexican Border in Arizona and Calif- 

 ornia, confined to arid or semi-arid country, not extending west of the 

 eastern base of the Cascades, Sierras, and mountains of southern 



California, except in the San Diego region manni Schimmer 



A.\. Dorso-internal margin of caudal tibia armed normally with three spines, 

 increasing in length distad. Dorsal surface of caudal metatarsus armed 

 along the median line with two minute spinulae. (General coloration 

 yellowish brown. Generic pronotal spots of general coloration. Ab- 

 dominal segments margined caudad with a slightly darker shade than 

 th(! general coloration in frequent individuals, giving them a banded 

 appearance.) Distribution: Eastern Nebraska southward to northern 

 Texas and New Mexico and southwestward to the Mexican Border 

 in eastern Arizona nebrascensis Lugger 



