156 THE UNIVERSITY SCIENCE BULLETIN. 



forms of North America by the genital opercule extending a little under 

 the base of the appendages. The ventral segment which precedes the 

 genital opercule almost straight on its longitudinal summit, very little 

 convex before the extremity. 



"The interocular space convex between the eyes, but without trace of 

 tubercle, scarcely wider than one eye. The eyes very slightly transverse, 



San Diego, Cal., coll. Coquillet, U. S. N. M,, Washington. 



Ranatra jyrotensa Montd. 1910. 



Montandon Bui. Soc. Sci. Bucarest, XVIII, p. 185. 



"Almost of the same size as R. fusca and R quadridentata ; length, 36.5 

 mm., of which 12.5 mm. are for the head and pronotum together, and 24 

 mm. for the abdomen; appendages quite robust, much shorter than the 

 abdomen, 18.8 not altogether 19 mm.; intermediate and posterior femora 

 quite long, 16 to 17 mm. (They are spread out at the sides in the speci- 

 men examined, but brought back behind the posterior one attain the 

 last abdominal suture.) 



"Eyes visibly transverse, as wide as the interocular part which is not 

 regularly convex, but very obtusely elevated in the middle, as for the 

 base of a tubercle. Cheeks converging in front, fitting most closely at 

 the extremity against the tylus, regularly narrowed, not protuberant, 

 the tylus slightly surpassing them in front. This character of cheeks 

 attenuate and converging in front distinguishes this insect from all other 

 North American forms in which the cheeks project, almost diverging at 

 the apex of each side of the tylus. 



"Anterior femora quite slender, but scarcely a fifth as long as their 

 coxae, without trace of tooth or sinuosity near the extremity, and with 

 the median tooth of the lower inner side very little elevated, obtuse and 

 little distinct. The anterior coxae almost as long as the pronotum on the 

 side; coxae and femur together scarcely longer than the intermediate or 

 posterior femora; anterior tibia very short, scarcely a little more than 

 a third of the length of the femur. 



"Metasternal plate a little convex, well prolonged behind where it is 

 lost between the posterior coxse with the first abdominal segment which 

 resembles in the middle a fissure, narrowed at the extremity of the 

 metasternum, all as elevated as the plate. 



"Memes cories," with membrane covering up the suture of the last 

 abdominal segment, as in the other American species. Pronotum quite 

 dilated in front, not much more dilated behind than in front, feebly 

 carinate on the anterior part. The prosternum is hollowed out in all 

 its width clear to the middle of its length; the bottom of the hollow is 

 flat without groove behind the coxse, the lateral sides elevated, vanishing 

 behind. 



"The specimen, unfortunately unique, is pale yellowish ochre; the 

 intermediate and posterior femora with some vague clearer annulations." 



Long Island, New York, U. S. N. M., Washington. 



"This species has a little of the appearance of R. brevicauda Montand. 

 of South America, but in this latter the cheeks are projecting; almost 

 diverging at the summit of each side of the tylus; the genital opercule 

 surpasses sensibly the extremity of the abdomen and the more robust 

 appendages are also proportionally shorter; but it has almost the same 

 form of vertex; by contrast, the anterior femur has a median tooth indeed 

 stronger on the lower inner side and the lower outer side, also has an 

 obtuse prominence at the place where the end of the anterior tarsus 

 comes when the tibia is folded back against the femur, and farther from 

 the end of the femur than the lower inner tooth." 



