168 THE UNIVERSITY SCIENCE BULLETIN. 



AAA. Medium sized, robust species — concluded. 



CC. Vertex 2V^ times synthlipsis; width of pronotum 11/7 

 times its length; width of scutellum IVs times its 

 length; length of insect 13.1 mm. to 14 mm. 



N. montezuma. 

 BBB. Vertex not twice as wide as synthlipsis. 



C. Vertex 1% times synthlipsis; width of pronotum 1% 

 times its length; width of scutellum 1% times its 

 length; length of insect 8 mm. to 13 mm. 



N. shooterii. 

 CC. Vertex but slightly wider than synthlipsis; width of 

 pronotum 2 times its length; width of scutellum IV5 

 times its length ; length of insect 12.6 mm. to 15.5 mm. 



N. insulata. 

 The following descriptions have been copied from Bueno, 1905. He 

 used Kirkaldj's copy of descriptions, which appeared in his Revision of 

 the Notonectidae, pt. 1, Trans. Ent. Soc. London, 1897, and added measure- 

 ments, etc. I therefore credit them "Bueno and Kirkaldy." 



Notonecta indica Linne 1771. 



Linne, "Mantissa Plantorum," p. 534. 



"Head rather large, notocephalic lateral margins straight, not very 

 divergent from the base; vertex varying from one and one half to twice 

 as wide as synthlipsis. Scutellum rather shorter than in N. undulata 

 Say. Hemelytra variable: (1) fulvous or dark stramineous, with a 

 broad black fascia near the apex, occupying the basal two thirds of the 

 membrane and the apex of the corium; (2) varying from bluish black 

 to violet brown, the corial margins of the clavus and a broad irregular 

 blotch about the middle of the corium, fulvous or dark stramineous. 

 Otherwise like N. undidata Say. 



"Long., 9.4 to 11 mm.; lat., 3.4 to 3.6 mm. — Bueno and Kirkaldy. 



Distribution: Utah, Nevada, California, Arizona, Oregon and Texas. 

 Bueno says that this bug is extremely abundant in Lake Texcoco, Mexico, 

 where its ova, together with those of one or two Corixas, are used as 

 food under the name "huantle." 



Notonecta howardii Buneo 1905. 



Bueno, Journ. N. Y. Ent. Soc, vol. 13, p. 151. 



"Notocephalic lateral margins of head curved; vertex twice as wide 

 as synthlipsis; base of eyes about twice as wide as synthlipsis. Pronotum 

 four-fifths broader than long, humeral and lateral margins sinuate. 

 Scutellum one-fifth longer than wide, not concolorous. Hemelytra 

 clouded with black going into smoky, and with a broad black band across 

 the membrane and the apex of the .corium. Apex of the membrane 

 smoky. Corium and clavus moderately clothed with a golden pubescence. 

 Membrane lobes subequal. Pedes: Intermediate femoral spur small, 

 rather blunt, concolorous. 



"Measurements: Vertex, 1 mm.; snythlipsis, 0.5 mm.; pronotum, lat., 

 3.5 mm., long., 1.9 mm.; scutellum, lat., 2.7 to 2.9 mm., long., 2.2 to 2.4 

 mm.; insect, long., 10.2 mm., lat. (pron.), 3.5 mm.; types. No. — , 

 U. S. N. M. 



"Described from two specimens in the U. S. National Museum, col- 

 lected by Dr. E. A. Mearns in Arizona." — Bueno and Kirkaldy. 



