1919.] NATURAL SCIENCES OF PHILADELPHIA. 109 



atypical. The Clarendon, Texas, male also strongly indicates a 

 tendency toward macclungi, in a general region where merely 

 atypical yn. maculipennis predominates. 



From the distributional data available it would seem that, in 

 a general way, true maculipennis follows the river valleys north- 

 ward from the region of its widest occurrence, while the higher 

 ground, the benches and ridges, carry southward tendencies toward 

 the more northern maccluyuji. When typical individuals of the 

 two forms are compared they appear widely separated, but a 

 series such as the present one shows the relationship very clearly. 



Specimens examined: 285; 167 cf , 118 9 . 



Texas: Brownsville region; 1 cf ; [B. I.].«3 Mission, Hidalgo 

 County; VIII, 6, 1912; (H.; in arid section covered with high 

 mesquite and a great variety of Opuntia) ; 1 9 . Lyford, Cameron 

 County; VIII, 6 and 7, 1912; (R. & H.; few in weedv field with 

 sand spur); 1 9. Katherine, Willacy County; VIII, 8, 1912; 

 (R. & H.); 5 cf , 3 9 . Gulf Coast of Texas; 1884; (Aaron); 2 cf , 

 1 9 ; [M. C. Z. and U. S. N. M.]. Robstown, Nueces County; 

 VIII, 9, 1912; (R. & H.; on plain of low mesquite, Opuntia and 

 joint cactus, with dry j^ellow grass); 2 cf. Benevides, Duval 

 County; VIII, 9 to 10, 1912; (R. & H.; fairly numerous in cleared 

 pasture overgrown with open stand of woody weeds); 10 cf , 7 9 . 

 Corpus Christi, Nueces County; VII, 29, 1912; (H.); 3 d', 3 9. 

 Gregory, San Patricio County; VII, 30, 1912; (H.; occasional on 

 grassy plain with mesquite); 3 cf. Beeville, Bee County; VII, 

 28, 1912; (H.; common in mesquite region with undergrowth 

 solely of dry 3'ellow grass) ; 12 cf , 12 9 . Victoria, Victoria County; 



VII, 27, 1912; (H.; occasional in field thickly grown up in grasses 

 and other vegetation); 4 c/", 1 9. Flatonia, Fayette Count}^ 

 475 feet; VIII, 19, 1912; (R. & H.); 2 cT, 2 9 . Waelder, Gonzales 

 County; VI, 25, 1897; (A. P. Morse); 1 d^ ; [M. C. Z.]. Navasota, 

 Grimes County; VIII, 14, 1915; (H.; in grassy areas among post 

 oaks); 2 (^ . Hearne, Robertson County; VIII, 14 to 15, 1915; 

 (H.; in sparsely grassed area near oak woods) ; 8 cf , 3 9 . Cotulla, 

 Lasalle County; VI, 12, 1908; (E. S. Tucker); 1 9 ; [U. S. N. M.]. 

 San Antonio, Bexar County; VI; (M. Newell); 1 9, type; [Hebard 

 Collection ex Brunei-]. Uvalde, Uvalde County, 1000 to 1100 

 feet; VIII, 21 to 22, 1912; (R. & H.; scarce on slopes among low 

 Acacia)\ 2 cf, 2 9. Carrizo Springs, Dimmit County; VI, 1885; 

 (A. Wadgymar); 1 cf, allotype; [Hebard Collection ex Bruner]. 

 Del Rio, Valverde County, 900 to 1100 feet; VIII, 22, 1912; (R. & 

 H.); 2 d', 2 9 . Marathon, Brewster Countv, 3940 to 4160 feet; 



VIII, 1 to 2, 1916; VIII, 20, 1916; (R.; scarce in moister areas); 

 VIII, 26 to 27 and IX, 2, 1912; (R. & H.; common everywhere 

 on plain where high grass occurred); 9 cf, 7 9. Garden Spring, 



^ Reported by Caudell as M. intertexta. 



