1919.] NATURAL SCIENCES OF PHILADELPHIA, 69 



an extreme with the bar itself virtually eliminated, leaving only 

 a pair of arcuate lines on the head (lateral margins of the bar) 

 and a median dark line on the median carina of the pronotum. 

 The geographic color variation is largely tonal. The Sanderson 

 and Persimmon Gap series have the pale areas quite whitish, 

 the brown Vandyke brown; the Marathon series and those from 

 the El Pasan region run to yellow in the pale areas, while the 

 Arizonan series largely (but not entirely) to light pinkish buff 

 in the same sections. The pale markings in the vicinity of the 

 humeral trunk of the tegmina, however, are always more whitish 

 than the other pale areas. The Pine Mountain series has a strongly 

 intensive type of coloration, the brown being very dark (blackish 

 brown) and the pale areas dull soiled buffy. 



Distribution. — The range of this species extends from an unde- 

 termined point in Colorado, at least as far north as Salida and 

 Colorado Springs," south to northern Durango (Lerdo) and east- 

 central Coahuila (Monclova),-" Mexico; east almost to the Pecos 

 River (Sanderson), Texas, west to central (Oak Creek Canyon), 

 and southern (Santa Catalina, Santa Rita and Huachuca Moun- 

 tains) Arizona. It doubtless extends south for a considerable 

 distance in the central mountainous regions of northern Mexico. 

 Its zonal range is Upper and Lower Sonoran, occurring in Upper 

 Sonoran islands in Transition surroundings. 



Its vertical distribution is, on the basis of present records and 

 information, from 2750 feet (Sanderson, Texas) to 7000 (Pine 

 Mountain and Lost Mine Peak, Texas) and even 7300 feet (Mount 

 Tritle, Arizona). In Texas alone the records range from the 

 minimum to near (7000 feet) the maximum elevations known 

 for the species, while in Arizona the records cover localities from 

 3800 feet (Sabino Basin) to 7300 feet (Mount Tritle). 



Biological Notes. — This insect is a very active one and flies 

 quickly upon being approached. The dried specimen would 

 hardly be called protectively colored, with its boldly striped 



1^ The specimen given by Scudder as "Colorado, 7000 (Morrison)" is also 

 clearly this species. We feel quite certain it came from the more southern part 

 of the state. 



Caudell (Proc. U. S. Nat. Mus., xxvi, p. 780, (1903)) reported a pair of this 

 species from Fort Collins, Colorado, and, with some doubt, immature material 

 from Salida, Colorado. These specimens are now before us. The Fort Collins 

 pair are typical of M. maculipennis macclungi, while a pair of immature speci- 

 mens from Salida clearly represent texana. 



^^ Reported as Montelovez; see comments by Hebard, Proc. Acad. Nat. Sci. 

 Phila., 1917, p. 252, (1917). 



