122 Proceedings of the Biological Society of Washington. 



width 0.178 mm.; prothorax, length 0.120 mm., width (inclusive of 

 coxae) 0.301 mm. ; pterothorax, width 0.360 mm. ; abdomen, width 

 0.392 mm.; tube, length 0.150 mm., width at base 0.069 mm., at apex 

 0.031 mm. 



Antennal segments: 12 3 



Length (/i) 36 50 52 



Width (m) 29 29 27 



Total length of antenna, 0.378 mm. 



Male (macropterous). — Much like female and of nearly the same size, 

 but with more slender antennfe. Fore legs scarcely more enlarged than 

 in female; tarsi more strongly toothed, the tooth nearly equilaterally 

 triangular. 



Measurements of allotype: Length 1.62 mm.; head, length 0.228 mm., 

 width 0.166 mm.; prothorax, length 0.128 mm., width (inclusive of 

 coxpe) 0.302 mm.; pterothorax, width 0.360 mm.; abdomen, width 

 0.367 mm.; tube, length 0.162 mm., width at base 0.069 mm., at apex 

 0.033 mm. 



Antennal segments: 12 3 



Length (m) 36 50 54 



Width (/i) 29 29 27 



Total length of antenna, 0.388 mm. 



Described from 22 females and 6 males taken from the flowers of apple, 

 at Roswell, New Mexico, in May, 1912, by the late Mr. A. G. Hammar. 



A very distinct species, remarkable for the produced vertex and the 

 absence of accessory hairs on the posterior margin of the fore wings. It 

 takes a natural place in the vicinity oijonesii and halophilus. 



Trichothrips fuscicornis sp. nov. 



Female {macropterous) .—Length about 2 mm. Color blackish brown, 

 paler posteriorly, with tarsi, apices of tibipe, and tube paler, the tube 

 with a decided suffusion of orange; antennae concolorous with body. 



Head about 1.17 times as long as wide, sides straight, abruptly rounded 

 to eyes and slightly converging posteriorly, occipital region faintly sub- 

 reticulate with anastomozing lines; postocular bristles pointed, about one 

 and one-third times as long as eyes; other bristles minute. Eyes small, 

 only about one-fifth the length of head. Anterior ocellus directed 

 slightly forward, and somewhat overhanging; posterior ocelli opposite 

 middle of eyes. Antennse about 1.9 times the length of head; segment 1 

 about three-fourths as wide as long, tapering slightly to apex ; 2 longer 

 and narrower than 1, subequal in length to 3-5, which are abruptly pedi- 

 cellate and successively narrower ; 7 shorter than either 6 or 8 ; 8 lanceo- 

 late, pedicellate; sense-cones short and moderately stout; formula: 3, 

 1-2; 4, 2-2; 5, 1-1+^ ; 6, 1-1 +' ; 7 with one on dorsum near apex. 

 Mouth-cone reaching fully two-thirds across prosternum ; labrum just 

 attaining tip of labium, which is rather broadly rounded. 



Prothorax smooth, about 0.6 as long as head and (inclusive of coxae) a 



