Bulletin, So. Calif. Academy of Sciences Vol. 47, Paet 3, 1948 A NEW SPECIES OF AMBRYSUS FROM DEATH VALLEY, WITH NOTES ON THE GENUS IN THE UNITED STATES (HEMIPTERA: NAUCORID^) Ira La Rivers University of California, Berkeley NAUCORID^ (Fallen) 1814 AMBRYSIN^ Usinger 1941 Ambry sus Stal 1862 Ambrysus funebris sp. nov. General appearance: the smallest, most compact species known to me — size 6.0-6.5 mm. long and 3.5 mm. wide. Dorsum con-spicuously lighter anteriorly than posteriorly, unmottled, shiny. Venter deep yellowish with conspicuous darkening centrally. Head: smooth, shiny, minutely punctulate. Color light yellow-ish in anterior two-thirds, brownish in posterior portion behind eyes ; two unequally spaced dark, blackish sinuosities occupy cen-trum, and between them, the very faint line of light brownish dots, increasing in size posteriorly, so characteristic an Ambrysus pat-tern, is barely discernible, fusing with the brownish posterior por-tion of head (which latter represents the "bilobed" basal spot of other species) ; some darkening at anterior margin of head also. When oriented so that dorsal plane is perpendicular to line-of-vision (i.e., the greatest amount of dorsum exposed to view), front of head is seen to be slightly protuberant before eyes, and distinctly truncate. Eyes coal-black ; outer margin slightly curved, inner margin straight, posterior margin strongly curved ; viewed posteriorly, eyes very distinctly, but not exceptionally strongly, protuberant above general head surface, the point of juncture forming a prominent sinuosity. Head broadly and deeply set into anterior pronotal border. Labrum same color as front of head ; ratio of length-to-width, 15::29 (50%); mouthparts darkening at tip. Head ratios are : 1) total length to width (including eyes), 75::107 (70%) ; 2) anterior distance between eyes to posterior distance, 51 : :72 (71%); 3) posterior distance between eyes to greatest length of head posterior to this line, 72 : :28 (39% ) . 103
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