14 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



very light yellow by transmitted light, nearly white by reflected light. 

 Receptaculum seminis conspicuous, brownish red. 



Described from 10 females. 



Male unknown. 



Locality, Yuma, Arizona, July 6, 1910. 



Food plant, Snake weed. 



Collector, Argyle McLachlan. 



Type.—Csit. No. 15725, U.S.N.M. 



ECraNOTHRIPS AMERICANUS, new species. 

 Figs. 31-32. 



Female. — Length of distended specimens 1.3 mm. The normal 

 lenpth is very probably not more than 1 mm. General color hght 

 brown to dark Hrown with considerable red hypodermal pigmentation. 



Head — Length 0.12 mm., width 0.16, almost rectangular, converg- 

 ing sHghtly toward prothorax; cheeks very slightly arched; sUghtly 

 retracted within prothorax ; front of head obtusely triangular. Eyes 

 large, not protruding, pilose, occupying ahnost three-fi.fths the width 

 of the head, black by transmitted hght, yellow by reflected light, 

 rather coarsely facetted. Ocelli large, subapproximate, the posterior 

 ones situated back of center of eyes ; orange yellow margined inwardly 

 with dark red crescents. The anterior ocellus is situated in a depres- 

 sion in the front. A small spine stands in front of each posterior 

 ocellus, and a row of four small spines extend in an arc in front of the 

 anterior ocellus. Head transversel}^ areolate behind the eyes. 

 Mouth cone broad at the base, short, reaching only a Httle more than 

 half-way across the prosternum, its sides straight. Maxillary palpi 

 Hght gray, two segmented, of medium length, the first segment very 

 much shorter than the second; second segment bears a slender hair 

 at the tip. Labial palpi minute. Antennae eight segmented, slender, 

 about two and one-half times as long as the head. Relative lengths 

 of segments as follows, taken from measurements from an average of 

 five antennae: 



7.7 



First two segments of antennae stout; the first nearly cyHndrical, 

 one and one-third times as broad as long; the second barrel-shaped, 

 four-fifths as long as broad; third segment distinctly stalked, the 

 fourth and fifth very shghtly so. All segments beyond the second 

 slender. Color: First two segments concolorous with the head; 

 three, four, and basal half of five gray; three and four sometimes 

 with a yellowish brown tinge apically; remainder of antennae hght 

 brown. Antennal segments with conspicuous spines on segments two 

 to five, those on two and three being noticeably blunt. The eighth 



