Dec.,i9o2.] BUKNO : NOTONECTID/E OF VlCINITY OF NeW YoRK. 233 



one fourth less than the width of the base of the eye. Lateral and humeral margins * 

 of the pronotum sinuate. Scjitelhim varying slightly in length, but occasionally reach- 

 ing and usually nearly reaching the base of the metanotum, black. Heiuelytra 

 variable in pattern and color. 



^^ AUe : basal nervules crimson, the others yellow brown. Pedes : coxx' black, in- 

 termediate tibial spur small, slender, not tipped with black. Abdominis dorsntn : seg- 

 ment I black, 2-6 brilliant scarlet, 7-8 reddish testaceous. Abdominis venfe?- black, 

 connexivum and central carina green. I-ong., 13-15 mm. ; lat., 4.9-5 mm." 



Personally, I have not found this species, but Mr. H. G. Barber 

 has taken it in the city, in a rock-hole that was being drained ; and 

 Mr. Davis has found it on Staten Island. It might at first glance be 

 taken for luidiilata var. charo/i, but is readily distinguishable from it 

 by the nearly parallel notocephalic margins, the greater size, and the 

 reddish tinge of the hemelytra. 



Notonecta undulata Say. 



'^ Head diverging curvedly (varymg in degree) from the synthlipsis, which is 

 about two fifths the width of the vertex. Proiiolttm, humeral margins as a rule not 

 distinct. Scutellum not quite one fourth shorter than the metanotum, varying in color 

 from pale luteous to black, with divers intermediate arrangements of the two colors ; 

 similar hemelytral markings occurring with dissimilarly marked scutella and vice 

 versa. Metanotum varying from luteous to black, with three or more dark castaneous 

 stripes, scutellar margin luteous. Hemelytra exceedingly variable, giving rise to a 

 number of well marked varieties, though these are linked by intermediate forms. 

 Long. 10. 2-12.6 mm.; lat. 3.4-4.2 mm." 



This species is represented in three varieties in this locality. The 

 pure moonlight-color or very pale greenish-yellow variety, luacitlata 

 Fieb., which occasionally exhibits a few dark markings, grades into 

 the next variety, undulata Say. The latter varies from pure ivory- 

 white to pale luteous, with a somewhat greenish-gold tinge in some 

 s}:»ecimens. It is marked with from a few indefinable brown spots at 

 the base of the membrane to a broadish band, covering the base of 

 the membrane and the apex of the corium. The third variety, 

 charon YJvxV., resembles the more heavily-marked specimens of the 

 preceding with clouded hemelytra. As a matter of fact, these three 

 varieties merge into each other by insensible gradations, and it is only 

 in a large series that this can be appreciated. 



The majority of the light specimens I have were taken in Central 

 Park, from about the middle to the end of March. A few were col- 

 lected this fall in Staten Island with Mr. Davis. The darker varieties 

 all came from Staten Island and were collected in October and No- 

 vember. 



