August, '15] 



CROSBY & HADLEY: LEPTOBYRSA EXPLAXATA 



413 



others. Towards the last of this stage two small ommatidia begm to show on the 

 anterior side of the group. 



Third stage. — Length including tubercles on head 1.4 mm. Outer side of first, tip 

 of second, third and fomlh joints of antennae, all the large tubercles on body, wing- 

 pads and dorsum of abdomen dusky with a greenish tinge. The outline of the eye is 

 now distinct and the ommatidia numerous, red. The wing-pads are conspicuous and 

 extend to second abdominal segment. The tubercles which had increased in size in 

 the preceding stage have become still larger and bear more glandular hans while the 

 smaller areas seem to have become obsolete. 



Fourth stage. — Length including tubercles on head, 2.25 mm. All tubercles have 

 become longer, more slender and are dusky. The sides of prothorax are more expla- 

 nate, the posterior margin is shghtly biconcave, while the rounded median portion 

 extends between the mesothoracic tubercles. The wing-pads extend to the fifth 

 abdominal segment; the lateral tubercles of the mesothorax occupy the extreme mar- 

 gin of the wing-pad and are nearer the apex than the base. Color dull yellowish; 

 base and tip of wing-pads, large oval spot on abdomen, spots at base of tubercles and 

 outer side of first, tip of second and thu'd, and distal two-thirds of fourth segment of 

 antennae dusky with a greenish tinge. Legs dull yellowish, tip of tarsi dusky. 



Under insectary conditions, the length of the nymphal stages has 

 been found to be as follows: 

 First stage, 6 to 7 days; 

 Second stage, 4 to 6 days; 

 Third stage, 3 to 6 days; 

 Fourth stage, 12 to 15 days. 



Under outdoor conditions, the length of stages is probably a httle 

 greater, as adults have been seen mating on July 20, and laying eggs 

 on July 25. 



Adult. ^ — Body short, oval in the female, more elongate in the male, shining black; 

 membranous parts of pronotum and integument of el}i;ra pale j^ellowish, semitrans- 

 lueent, nervures yellowish. Head rather small, black, with three white frontal spines, 

 two approaching each other, the middle one comparatively stouter; besides, there are 

 two other more slender spines extending from behind the eyes towards front. An- 

 tennae long, finely pilose, yellowish, the tips infuscated; two basal joints slightly 

 thicker than the foUoudng ones, first joint twice the length of second, third httle more 

 than three times as long as fourth. Bucculae yellowish, narrow, angulate and broader 

 behind, the edge upturned a little. Pronotum transverse, feebly convex, coarsely 

 punctured, and shining black; in fresh specimens the sides of the pronotum are covered 



EXPLAN'ATIOX OF PlATE 2.3 



Leptohyrsa explanata Held. 



Fig. 1. Adult. 



Fig. 2. Egg. 



Fig. 3. First stage nymph. 



Fig. 4. Second stage nymph. 



Fig. 5. Third stage nymph. 



Fig. 6. Fourth stage nymph. 



iHeidemann, O. Proc. Ent. Soc. Wash. X, 105-108. 



