NEW CALIFORNIA AND GEORGIA THYSANOPTERA. 17 



transparent. One specimen is more deeply tinged mth yellowish 

 brown. 



Male: Length 0.833 mm. Smaller and more slender than female 

 but similar in color; orange-colored testes prominent. 



Described from two female and one male taken from monkey 

 flower (Mimulus sp.) June 6, 1910, San Jose, Cal. (P. R, Jones). 



Living specimens are very wliite and fly readily; they also have 

 the power of springing. 



24. Genua ANTHOTHRIPS Uzel. 

 Key to the Species. 



1. Postocular spines wanting; antennte almost uniformly brown except segment 2 and 



base of segment 4, which are light hr own.. Anthothrips niger Osboni. 



2. Postocular spines well developed. 



a. Postocular spines and most of the spines on postero-lateral margin of abdominal 



segments knobbed Anthothrips favipes new species. 



a\ Postocular spines and spines on postero-lateral margin of abdominal segments 

 not knobbed. 



6. Antennae uniformly brownish black ; apex of femora with a small, anteriorly- 

 directed, triangular tooth within . Anthothrips nigricornis new species. 



¥. Segments 3 and 6 of antennae, eyes, fore tibiae, all tarsi, and other lighter 

 parts of body shaded with orange yellow; femora without tooth 

 at apex Anthothrips verbasci Osborn . 



y^. Intermediate segments of antennae and other light parts of body light 

 brown ; femora without tooth at apen. Anthothrips variabilis Crawford. 



DESCRIPTION OF NEW SPECIES. 



Anthothrips nigricornis new species. (PI. V, figs. 1-4.) 



Measurements: Head, length 0.30 mm., width 0.283 mm.; pro- 

 thorax, length 0.233 mm., width 0.416 mm.; mesothorax, width 0.483 

 mm.; abdomen, width 0.536 mm.; length of tube 0.15 mm.; total 

 length of body 2.383 mm. Antennae: Segment 1, 30//; 2, 48/<; 3, 51/i; 

 4,63//; 5,60«; 6,51/f; 7, 4S,«; 8,30/^; total length of antennae, 0.381 mm. 



General color very dark brown to black with purplish pigmentation. 



Head about as long as wide; cheeks nearly straight and parallel; 

 sides of head set with a few minute spines; postocular spines promi- 

 nent, blunt, but not knobbed. Eyes rounded, not protruding, finely 

 and closely faceted. Ocelli widely separated, situated far forward, 

 anterior one on extreme vertex; two small spines in front and one 

 behind each posterior ocellus. Mouth-cone slightly longer than its 

 breadth at the base, bluntly pointed. Antennse approximate, about 

 one and one-third times as long as the head, uniformly dark brown, 

 segments 1 and 2 sometimes darker; spines pale and weak; three short 

 sense-cones on segment 3 and two short ones on segment 4. 



Protliorax slightly more than three-fourths as long as the head; 

 one long, blunt spine on each posterior angle and one on posterior 

 margin just inside of the former pair; one short spine near the anterior 



