Zoology.] NATURAL HISTORY OF VICTORIA. [Insects. 



Eyes moderately convex, placed far behind the antennae and in front of prothorax, nearly in 

 middle of side of head. Prothorax narrow, no wider than the head in front, short, semi- 

 cylindrical, slightly keeled in the middle, without lateral keels. Presternum with a small 

 conical spine between bases of anterior legs ; mesosternum and metasternum narrow, widely 

 channelled along middle. Elytra narrow, linear, only slightly opaque, shorter than abdomen 

 (sometimes absent). Wings as long as the elytra (or sometimes absent). Abdomen very long, 

 slender, cylindrical.] 



Description. — Both sexes destitute of wings in the adult state, but with 

 oblique lines on the sides of the mesothorax and metathorax, resembling' the 

 indications of wings in the pupse of winged locusts. Female: Head, thorax, and 

 abdomen moderately compressed, with a slightly marked keel from the tip of the 

 snout to the sur-anal plate. Head, thorax, and abdomen rninutely granular. 

 Prothorax divided by a fine transverse sulcus a little behind the middle; metathorax 

 divided similarly, a little in front of middle. Sub-anal plate less than half the 

 length of the last normal joint of the abdomen, and projecting very slightly beyond 

 the upper and lower pairs of plates. Lateral appendages very small. Antennae 

 flattened, 1st and 2nd joints narrow, 3rd and 4th joints widest; thence gradually 

 tapering to the end. A prominent ridge extends from front of eye to tip of snout. 

 First and second pairs of feet very small. A swollen tympanum at inner side of 

 distal end of hind femora. Two rows of minute spines on upper surface of distal 

 two-thirds of hind tarsi. Outer side of thighs convex, granular, with an upper 

 keel and a lower, one bordered by a groove, on each side. Under side of head 

 angularly keeled from tip of snout nearly to mouth. Male : Differing from female 

 in much smaller size and in having a very long, compressed, sharp-pointed sub-anal 

 plate, about as long as the last three normal joints of the abdomen. Color: 

 Variable; frequently both sexes of a dull pea-green color, with a broad, distinct, 

 white, satin-like band from behind the eye to the base of hind thigh, and sometimes 

 continued along thigh to distal end; tarsi glaucous, reddish at base, with the spines 

 black; antennae testaceous. Other specimens are entirely testaceous reddish, and 

 others greyish-brown, with the white band as before ; but the inside of the base 

 of the thigh usually brighter or redder testaceous than any other part. Some 

 specimens have irregularly scattered black dots. Measurements — Female: Total 

 length from front end of head to tip of sub-anal plate, 2 ins. 3 lines. Proportional 

 measurements to total length, -^; head, j 2 %; prothorax, y~oo? mesothorax, -^5 ; 

 metathorax, y^; (dorsal surface of whole thorax, ^55); abdomen, -, 5 6 ; hind 

 femur, y 2 ^ ; hind tibia, y 5 j hind tarsus, y§^ ; middle femur, y§^ ; middle tibia, 

 y^j ; middle tarsus, y§-^ ; anterior femur, y§^ ; anterior tibia, y^ ; anterior 

 tarsus, Too? sub-anal plate, y§^. Male: Total length from front end of 

 head to tip of sub-anal plate, 1 in. 5 lines. Proportional measurements to total 

 length: Antennas, y^; head, f^', prothorax, j~ ; mesothorax, yf-^ ; metathorax, 

 Y^', (dorsal surface of whole thorax, y^); abdomen, ^5; hind femur, y^>; hind 

 tibia, Yoo > hind tarsus, y§^j middle femur, yf-j; middle tibia, Yod> middle tarsus, 

 y§^ ; anterior femur, yj^ ; anterior tibia, y^-5 ; anterior tarsus, y^ ; sub-anal 

 plate, - 



100. 



The most striking characteristic of the Locusts of this genus 

 is the position of the eyes in the middle of the sides of the very 

 long, slender, conical head, far removed from both the antennae 

 and the prothorax. 



[ 153 ] 



