298 FAMILY VI. ACRIDID.E. THE LOCUSTS. 



tentive to the females, excitedly approaching them and fiddling with rapid 

 vertical movements of the closed hind legs. Usually no sound was audible 

 to me during this act of stridulation, but occasionally I could catch a dis- 

 tinct and rather pleasant 'seep' resembling a bird note at a distance rather 

 than the note of an insect. The female made similar motions, but less 

 often and less energetically. Active in direct sunshine, they became slug- 

 gish when clouds obscured the sun and then were very easy to approach, al- 

 lowing the hand to come within two or three inches if it were advanced 

 with caution." 



129. TRIMEROTBOPIS HURONIANA E. M. Walker, 1902, 6. Lake Huron Locust. 

 Size medium or rather small. General color ash-gray, varied with 

 brown and white. Face pale ash-gray mottled with darker; occiput brown- 

 ish-fuscous; a pale postocular stripe extending back on margins of pro- and 

 metazona, sides of prozona with two whitish spots; antennae grayish-brown, 

 darker apically. Tegmina usually ash-gray or brownish with darker fus- 

 cous cross-bars, one at basal third, a more solid one at middle; apical third 

 transparent, usually with scattered fuscous spots; the bars and spots ofter 

 faint or wanting, the tegmina then with only an ill defined clouding of 

 basal fourth. Wings with disk very pale yellow; width of fuscous median 

 band one-sixth or slightly more the length of wing, the spur extending half 

 way to base; apical portion hyaline, immaculate". Hind femora with outer 

 face pale gray with a yellowish preapical band and faint basal and median 

 oblique fuscous bars, these more distinct in male; inner face black with 

 two pale bars. Hind tibiae dull yellow the base sometimes paler. Vertex 

 distinctly longer than broad, male, but feebly so, female, median carina 

 low but distinct; sides moderately elevated, sinuous, converging gradually 

 but not strongly to meet those of frontal costa; foveols small, triangular, 

 well defined. Frontal costa rather wide, silicate throughout, expanded at 

 but feebly constricted just above and below the ocellus. Antennae four- 

 fifths, male, five-sevenths, female, the length of hind femora. Prozona 

 about two-fifths the length of metazona, its median carina slightly the 

 higher; metazona broad, its surface densely and finely rugose-punctate, the 

 median carina very low; hind margin right-angled, male, obtuse-angled, 

 female. Length of body, $, 1921, 9, 2628; of antenna?, $, 9.5 10.5, 

 9, 9.5; of tegmina, $, 21 22, 9, 2627; of hind femora, $ ,11, 9 , 13 mm. 



Southampton, Ontario, Aug. 21 (Walker}. This species, says 

 Walker (loc. cit.), seems to replace T. inaritiiim on the northern 

 part of the east coast of Lake Huron. In the vicinity of South- 

 ampton there is a limited extent of wide, sandy heach, north of 

 which the shore is continuously rocky. On this beach huroniana 

 is to be found under very similar but more boreal conditions to 

 those under which innritima is found further south. In flight it is 

 extremely alert, and its stridulation is peculiar, being a very 

 rapid but not loud crepitation, interrupted about thrice in a sec- 

 ond, so that at a little distance it seems to be composed of sepa- 

 rate notes. Usually three, sometimes four of these, are produced 

 at a time." 



