hungerford: aquatic hemiptera. 201 



"Texas, Belfrage U. S. N. M., Washington and my collection. 



"This species in its form typical, of deeper color, is without any doubt 

 very close to A. iiitidulus Montand, 1909, of Mexico. However, the corium 

 appear always sensibly lefs developed, and the punctation of the anterior 

 angles of the pronotum less accentuated." 



Ambrysus circwmcinctus Montd. 



Montaiuldii, Bui. Soc. Sci. Bucarest, XIX, No. 3, p. 5, 1910. 



"Form oval, hardly more attenuated in front than in the rear. Colora- 

 tion dull uniformly yellowish on head and pronotum, a little infus- 

 cated on the scntellum and the elytia. Length, 8 mm.; head medium 

 rather weak, with the eyes quite convergent in front for almost their 

 entire length, the convergence a little less accentuated behind. Anterior 

 border of the head quite regularly arcuated and very narrowly blackish 

 at the tip. which margin i= notably anterior to the level of the e^ es. The 

 head above, at least, as long as broad, between the eyes behind, about 

 three times wider between the internal posterior angles of the eyes than 

 the width of the eye at the same level; posterior portion of the head 

 sunken into the median incisui-e of the pronotum, visibly longer than the 

 anterior portion behind the eyes; punctuation of the head very fine, 

 rather dense, but irregular and inconspicuous. Hardly a little more 

 accentuated near the eyes and in front. Vertex uniformly pale without 

 apparent markings. 



"Pronctum with lateral margins feebb' but rather regularly arcuated 

 and divergent behind for almost their entire length, save in region of 

 the posterior angles where they are narrowly subparallel. The angles 

 are almost right, or a little obtuse, and sightly rounded at the summit. 

 The lateral margins are very narrowly blackish on their extreme lateral 

 margin. Anterior angles of pronctum rather acute but not arcuate at 

 the summit. Anterior margin of pronotum profoundly incised. The 

 transverse median incisure is rather large, but quite profound, the 

 lateral incisures well accentuated behind the e es. They are, however, 

 a little less transverse than in A. puIchcUus. The entire surface of pro- 

 notum rather uniformly yellowish, hardly paler on the narrow pos- 

 terior portion, a little depressed but without an apparent furrow, the • 

 denression almost lacking in the middle. Punctuation very fine, rather 

 dense and irregular over the entire surface. Median sinuositv bordered 

 bv a weak margin le?s accenuated and with very fine and superficial 

 transverse wrinkles, that are not very visible, behind the middle of the 

 anterior border without apparent depressions, although this median por- 

 tion may be visibly limited on each side by a slightly depressed oblique 

 line, irregular, appearing a little 'posselee.' 



"Scutellum slightly and rather uniformly darkened, with the basal 

 angles and the summit paler, unpolished with the surface very finely 

 granulated. 



"'^orium quite uniformly pale brownish, having the scutellum and 

 embolium in large part pale, the external margin very narrowly blackish, 

 slightly arcuated; margin of cerium behind the embolium very obtusely 

 sinuated. Commissure of the clavus narrowly pale, near the middle 

 shorter than the length of the scutellum; posterior margin of the corium 

 with a semi-circnlar yellowish spot. Disc of the corium appearing cov- 

 ered by a very fine pubescence almost clear. Membrane brownish con- 

 colorous with the corium. 



"SegTnents of connexivum plainly visible behind the narrow elytral 

 margin; unpolished, yellowish, without spots on the sutures, but with the 

 extreme outer margin very narrowly blackish; posterior angles of the 

 segments not projecting, following well the abdominal curve except on 

 the last segment, who?e angle is a little prolonged behind, but scarcely 

 acute at the tip on each side of the female genital pieces. 



