464 Report of the Department of Entomology of the 



and fifth instars seemed to be most affected, and only one hairworm 

 was observed to make its escape from each insect, which was accom- 

 plished through the anus. The extent to which hairworms occur 

 in tree crickets seems to show considerable variation from year to 

 year, and was greatest during July and August in 1908 and 1909. 

 In subsequent years they have been observed much less frequently. 

 As orthoptera generally are subject to parasitism by these creatures, 

 specimens of the hairworms were sent for identification to Dr. B. H. 

 Ransom of the U. S. Bureau of Animal Industry who reported that 

 they were larvae of a Mermis sp. Because of their immature con- 

 dition it was stated that it was not possible to determine definitely 

 if they were the same species as exist in other kinds of crickets 

 and grasshoppers. 



Stalk-boring insects. — Eggs of nigricornis and quadripunctatus are 

 sometimes destroyed by various species of stalk-borers. These 

 latter are not true parasites, but the effect of their operations, in 

 tunneling through the central pith of weeds and other plants and 

 feeding upon it, is to hollow out stems and stalks, which effectually 

 disposes of any eggs of a tree cricket that happen to be in the path 

 of the boring insect. 



key to the species of (Ecanthus found in new YORK state. 



A Basal segment of antennae with a swelling on the front and inner side. First 

 and second segments each with a single black mark. 

 B Basal antennal segment with a round black spot. (Fig. 30, a.) 



niveus De Geer 

 BB Basal antennal segment with a J-shaped black mark. (Fig. 30, b.) 



angustipennis Fitch 

 BBB Basal antennal segment with a straight club-shaped black mark. 



exclamationis Davis 

 AA Basal antennal segment without a swelling on the front and inner side. First 

 and second antennal segments each with two black marks or entirely black. 

 Tegmina of male 5 mm. or less in width. 

 B Head and thorax pale yellowish-green or black or marked with both colors. 



C First antennal segment with a narrow black line along inner edge 

 and a black spot near the distal end. Body entirely pale yellowish- 

 green, quadripunclatus Beut. 

 CC First antennal segment with black markings similar to above, 

 but broader and usually confluent, sometimes covering the 

 whole segment. Head and thorax often with three longitudinal 

 black stripes; ventral side of abdomen always solid black in life. 

 (Fig. 30, c, d.) nigricornis Walker 

 BB Head, thorax and antennae reddish brown. Wings in life with con- 

 spicuous green veins. Marks on basal antennal segment broad but 

 seldom confluent. pini Beut. 

 AAA Basal antennal segment without a swelling on the front and inner side. Basal 

 portion of antenna red, unmarked with black. Tegmina of male about 8 mm. 

 wide. latipennis Riley 



