440 PROCEEDINGS OF THE ACADEMY OF [June, 



Size medium for the genus, form robust; head rather large and 

 rounded, but considerably flattened in front. Maxillary palpi much 

 as in N. griseus, but with the penultimate segment much more de- 

 cidedly constricted in the proximal portion. Eyes broad-ovate, not 

 at all protruding. Pronotum as in griseus. Tegmina less than half 

 as long as caudal femora, apex at humeral angle very broadly and 

 roundly obtuse-angulate, distal margin of dorsal field oblique, passing 

 into the sutural margin arcuately without angulation, the intermediate 

 channel not conspicuous and forming part of the dorsal field, longi- 

 tudinal veins very heavy and straight, cross-veinlets numerous but 

 very faint. Wings absent. Ovipositor slightly longer than the 

 caudal femora,'*'^ rigidly straight, apex of same scarcely enlarged, 

 dorsal margin of apex armed with an even series of heavy, sharp 

 teeth. Subgenital plate scoop-shaped, shorter than in N. fasciatus, 

 with caudal margin straight. Caudal femora with greatest width 

 (meso-cephalic) contained less than three times in the length. Spines 

 of caudal tibiae stiff, covered with very short hairs, margins very 

 finely serrate; caudal metatarsus furnished on dorsal and ventral 

 margins with unusually heavy bristles. 



Fig. 15. — Nemobius ambitiosus. Ovipositor. (Greatly magnified.) 



A male bearing the same data as the female here described furnishes 

 the additional information given below. 



Size slightly smaller, form similar to female. The tegmina are 

 translucent and shiny, with the dorsal field when in repose having 

 the sides subparallel and the caudal margin broadly and very evenly 

 arcuate. Subgenital plate similar to that of N. fasciatus. 



Measurements {in millimeters). 



Thompson's Mills, Ga. 



Averages of series. 



cfd^ 9 9 



Length of body 7 . 2 (6 . 6-7 . 8) 7 . 5 (6 . 9-8 . ) 



Length of pronotum 1.6(1.5-1.7) 2 . (1.9-2.1) 



Caudal width of pronotum 2.1 (1 . 9-2 .3) 2 . 4 (2 . 3-2 . 5) 



Length of tegmina 4 . 4 (4 . 2-4 . 5) 2 . 9 (2 . 7-3 . 1) 



Length of caudal femur 5 . 6 (5 . 4-6 . ) 6 . (5.7-6. 3) 



Greatest width of caudal femur 2 . 2 (2 . 1-2 . 4) 2 . 3 (2 . 2-2 . 4) 



Length of ovipositor 5.2 (4 . 9-5 . 6) 



*^ Examination of the large series before us shows that the length of the ovi- 

 positor is variable in the present species and the average measurements show that 

 it is usually not as long as the caudal femora. 



