OF WASHINGTON, VOLUME XIV, 1912. 141 



Measurements of holotype: Length 1.56 mm.; head, length 0.252 mm., 

 width 0.180 mm.; prothorax, length 0.180 mm., width (inclusive of coxae) 

 0.300 mm.; pterothorax, width 0.312 mm,; abdomen, width 0.360 mm.; 

 tube, length 0.120 mm., width at base 0.073 mm., at apex 0.038 mm. An- 

 tennal segments: 1, 44 /* by 41 M; 2, 53 M by 35 /u; 3, 51 M by 31 M; 4, 62 p. 

 by 35 M ; 5, 57 M by 30 n; 6, 53 M by 27 M ; 7, 48 M by 24 M; 8, 27 M by 13 M ; 

 total length of antenna, 0.39 mm. 



Male. Much smaller than female; length about 1 mm. Color luteous, 

 shaded with gray on femora, tibia?, segments 4-8 of antennae, and apical 

 three-fourths of tube. Ocelli apparently wanting. Prothoracic bristles 

 rather more capitate than blunt. Abdomen slender. Otherwise similar to 

 female. 



Described from 1 female (holotype) from Brownsville, 

 Texas, taken December 8, 1910, in sweepings from Bermuda 

 grass; and 1 male (allotype) from Padre Island, Texas (oppo- 

 site Point Isabel), taken June 28, 1908, "in sweepings from 

 grass, etc." Bo_th specimens were taken by Mr. Hart. 



The coloration of this species is remarkable, as is also the 

 structure of the third antennal segment. 



It will be noticed that the two illustrations given herewith 

 are unfortunately of the male, for the reason that the female 

 was not known until two years after the execution of the 

 drawings. 



Genus RHYNCHOTHRIPS nov. 



s, beak; Op^, a wood worm.) 



Head little, if any, longer than broad, about equal in length to prothorax; 

 cheeks finely roughened, without spiniferous tubercles. Antenna? eight- 

 segmented, the last two segments closely united. Eyes one-third or one- 

 fourth as long as head. Ocelli placed far forward, the median one overhang- 

 ing, sometimes borne at tip of slightly produced vertex. Mouth cone 

 unusually long and slender, fully as long as dorsum of head, attaining or 

 surpassing front margin of mcsosternum; lab rum very acute, elongate, 

 sometimes one and one-third times as long as width of head. Prothorax 

 large, heavy, nearly or quite as long as head, with median dorsal thicken- 

 ing; anterior and posterior margins concentric. Fore tarsi usually unarmed. 

 Wings, when present, of nearly equal width throughout. Abdomen broad 

 and heavy, with short bristles. 



Type: Rhynchothrips pruni, new species. 



This genus will also embrace Trichothrips tridcntatus Shu 11 

 and T. buff a Hood. The very long mouth cone and the large, 

 heavy prothorax are distinctive. Though two of its species 

 were described in Trichothrips, it appears to be much more 

 closely related to Liothrips. All the known species occur under 



