3'20 Report of the Department of Entomology of the 



■L. pratensis, Fourth Stage. 



Fourth Instar. — Body, larger; elongate-ovate; broad and long. Lateral margins 

 narrowest behind the head, gradually widening to the third segment of the abdomen, 

 then abruptly to the anus. Integument 

 microscopically hairy. Abdomen, pyri- 

 form. Head, small; quadrangular, 

 lateral margins rather sharply converg- 

 ing at apex. Eyes compound. Hairs 

 regularly placed as in previous instars. 

 Prothorax, equal to the head in 

 length; sub-rectangular; lateral margins 

 only slightly divergent; hind margin 

 somewhat wider than the transverse 

 diameter of the head through the eyes. 

 Mesothorax, about one-half longer than 

 the prothorax; slightly wider than the 

 metathorax; lateral angles projecting 

 nearly to the second abdominal seg- 

 ment. Metathorax, somewhat longer 

 and narrower than the preceding seg- 

 ment; hind margin at the lateral angles 

 reaching the middle of the second abdominal segment. 



Appendages. — ■■Antenna, strong; joint I is about one-half the length of joint IV; 

 joint III is four-fifths the length of joint II, which is the longest member. Legs, 

 long and slender; femora of about the usual proportional length; femora III about 

 one-fifth longer than femora I; tibiae I about one-half the length of tibiae III, which 

 are about one-third longer than tibiae II. The tarsi are as usual. Hairs on the 



body are placed as usual, but are 

 somewhat smaller. 



Color, green throughout; wing 

 pads often lighter yellow; top of 

 head, tips of wings and median 

 abdominal spot yellowish. 20 



Fifth Instar. — Body, larger; 

 elongate-oval; lateral margins nar- 

 rowest behind the eyes, gently 

 curved to caudal margins. Meso- 

 thorax and abdomen of about the 

 same width. Hairs less noticeable 

 than before. Head, small; sub- 

 triangular; base of proboscis caus- 

 ing outline to be acutely triang- 

 ular; anterior margin flattened. 

 Eyes extending beyond the head; 

 compound. Integument, smooth; 

 thickly covered with microscopic 

 hairs. 



Prothorax, longer than the head; 

 broad; narrow; narrowest just 

 behind the eyes; anterior lateral 

 angles strongly rounded ; posterior 

 lateral angles sub-angulate. Meso- 

 thorax, somewhat wider and about four times as long as the prothorax; lateral margins 

 straight; caudo-lateral angles produced, reaching the fifth abdominal segment. 

 Metathorax, about the same width and length as the mesothorax. 



20 Pratensis differs in the fourth instar chiefly in its greater size, color and shape 

 of the body. The thorax is strongly mottled and the five characteristic black 

 spots are distinct. The pro- and meso-thorax are about equal in length. The 

 third and fourth antennal joints are about equal in size. See Fig. 23a. 



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Fig. 24. — Fifth Stage Nymph. 



