THE CANADIAN ENTOMOLOGIST. 101 



Canmula pellucida. — This is the insect which has occasionally been 

 very destructive in parts of California and Nevada. It has since spiead 

 eastward into Idaho, where it is very destructive the present season, cover- 

 ing an area of at least 1,300 square miles of territory. It also appears 

 in great numbers, with several other species, in the Red River Valley of 

 Minnesota, North Dakota and Manitoba. I also observed it abundantly 

 in the Prickly Pear and Gallatin Valleys of Montana, near the mouth of 

 the Yellowstone, in North Dakota, in portions of Wyoming, Colorado 

 and the extreme western parts of Nebraska. It also occurs in the New 

 England States and British America. This is a species which readily 

 adapts itself to any new locality, being the most easily acclimated of any 

 of our injurious locusts. When once established it is there to stay, and 

 will require earnest attention from time to time in the future. In fact, I 

 consider this locust, though not migratory, fully as destructive as the 

 Rocky Mountain or true migratory locust, from the fact that it so soon 

 becomes acclimated. 



Acridmm aniericanmn. — This large, handsome locust is the species 

 which occasionally devastates Yucatan, Central America and Mexico, 

 and even reaches the United States in injurious numbers along our south- 

 ern coasts. It has also been known in dangerous numbers as far north- 

 ward as the Ohio River, and occurs sparingly as far north as the Northern 

 States, but I imagine never reaches British America. 



Detidrotettix longipennis. — "Post Oak Locust" of Texas. During 

 the spring of 18S7, while visiting Washington County, Texas, to investi- 

 gate a local outbreak of an injurious locust, I heard of a species that was 

 attacking the oaks of that particular region, and in some places entirely 

 defoliating them. On my way from the region where I had been working, 

 to the city of Brenham, we passed through the infested locality, and I 

 obtained some of the insects in question, which were then in the larval 

 stage. A careful examination proved the insect to be new and congeneric 

 with a species heretofore collected only in the vicinity of St. Louis, 

 Missouri, which also occurred only on oak. About a year later this 

 species was described by Professor Riley under the above name. The 

 insect occurs in two forms, long-winged and short-winged. The former 

 flies with great ease and often leaves the trees in midday and alights in 

 fields and other clearings — with the least .disturbance it rises again and 

 flies to the tops of the adjoining trees. The larvge and pups; are also ex- 

 ceedingly active, and run over the branches and trunks of trees with great 



