GEOLOGICAL SURVEY OF THE TERRITORIES. 281 



prominent, flat, not sulcate; margins parallel, punctate, slightly de- 

 pressed at the ocellus, reaching the clypeus ; lateral carinas distinct and 

 arcurate, reaching the lower angles. Pronotum short, truncate in front, 

 angle behind, tricarinate; median carina slightly elevated ; the lateral 

 carinas more obtuse, convergent a little in front of the middle, forming 

 an entering obtuse angle ; divergent anteriorly and posteriorly ; cross 

 incision 3 sinuate, cutting all the carinse, and situated about the middle ; 

 incisions 1 and 2 represented on the dorsum by cross rows of punctures. 

 Elytra narrow, and shorter than the abdomen. Posterior femora not 

 passing the abdomen. 



Color (siccus) : Yellow with brownish spots and stripes. Face yellow j 

 cheeks yellow and fuscus ; a narrow fuscus stripe along the cranium ; 

 a broad stripe of the same reaching from each eye to the pronotum. 

 Pronotum with alternating dashes of yellow and brown ; lateral carinas 

 yellow ; corners of the posterior lobe brown ; sides darkest above, yellow 

 below. Elytra pale reddish brown, fading toward the apex, with four 

 brown spots in a row along the middle field, and a little dash of the same 

 near the base. Wings hyaline ; nerves mostly white. Abdomen with 

 rings of yellow and brown. Disk and two spots on the upper carina of 

 the posterior femur reddish-brown. Antennas yellow, darkest at the 

 tips. Under surface pale yellow. 



Dimensions : Female, length .88 inch ; to tip of the elytra, .75 inch ; 

 femur, .50 inch. 



Habitat : Southern Colorado and, I think, Eastern Wyoming. 



[Note. — The living insect is a pale pea- green where the dry is yellow. 

 This and all other species w T ere placed in alcohol before being dried.] 



Variety : a. Face nearly vertical ; frontal costa more prominent and 

 somewhat sulcate ; lateral carinas not so much bent or so divergent ; cra- 

 nium not quite so convex. Lateral carinas of the pronotum less con- 

 stricted. The yellow spaces broader and paler ; the brown more 

 restricted. This may prove to be a distinct species, but the general 

 appearance is so much the same that I have preferred describing the 

 latter as a variety until more specimens can be obtained. Females 

 only seen. 



REMARKS ON THE CALOPTENUS SPBETUS. 



The following additional facts in regard to this destructive species 

 have been obtained since the publication of the report of last year. I 

 would remark, first, that a pretty full account of the incursions of this 

 insect into the Mississippi Valley has been published in the American 

 Entomologist by the lamented Walsh, who, after a thorough examina- 

 tion of all the data he could obtain, comes to the following conclusion, 

 which I quote in his own words : 



The above facts, aud others which it would be tedious to particularize, sufficiently 

 show that the Hateful Grasshopper, when suddenly transferred from its native Alpine 

 home in the Rocky Mountains, some eight thousand feet above the level of the sea, to 

 the warm regions of the valley of the Mississippi, less than a thousand feet above the 

 sea level, gradually becomes diseased and barren, and loses, more or less, its natural 

 appetites and instincts. Why we do not observe the same phenomena in the case of 

 the Colorado potato bug, which was originally a denizen of the same cold Alpine 

 country, is not difficult to explain. The former insect reaches the Mississippi lowlands 

 at one sudden flight, and in one season ; it has therefore no opportunity to become 

 gradually acclimatized aud inured to the new conditions of life under which it is called 

 upon to exist. Consequently, it becomes diseased and barren, and finally perishes. 

 The latter insect, on the other hand, has reached the Mississippi lowlands only by slow 

 aud gradual approaches, breeding at every way-station on the road, and thus becom- 

 ing, generation after generation, more and more acclimatized to a higher temperature, 

 as indicated by the thermometer, and to a greater atmospheric pressure, as indicated 

 by the barometer. Consequently, it may now be considered as a permanently accli- 

 matized resident of our great western valley ; though even here it thrives much better, 



