THE CANADIAN ENTOMOLOGIST. 139 



I, 45/^; 2, 56/^; 3, 62/x; 4, 56/x; 5, 59/x; 6, 5i/a; 7,45// ; 8, 33/x ; total, 

 .41 mm.j width at segment 4, .039 mm. 



Male. — Forma brachyptera. Slightly smaller than female. Length 

 about I.I mm. Prothorax very slightly, if any, heavier than in female. 

 Fore femora slightly more swollen ; tarsal tooth a little stouter. Abdomen 

 slender, tapering from near the base. 



Measurements : Length, 1.09 mm.; head, length .17 mm., width 

 .19 min.; prothorax, length .192 mm., width (inclusive of coxae) .37 mm.; 

 pterothorax, width .32 mm.; abdomen, width .38 mm; tube, length 

 .13 mm., width at base .083 mm., at apex .036 mm. Antennae: Segment 

 I, 45/^ ; 2, 50/x; 3, 56/x ; 4, 49/x ; 5, 53/x ; 6, 47/x ; 7, 43// ; 8, 29/x ; total, 

 .37 mm.; width at segment 4, .034 mm. 



Described from fifteen females and seven males, taken in February 

 under sycamore bark at Plummer s Island, Maryland (in the Potomac near 

 Washington, D. C), by Mr. W. L. McAtee. 



The form of the apical antennal segments seems to ally this species 

 quite closely to T. ambitus Hinds, from which, however, it is abundantly 

 distinguished by the shorter tube, shorter and broader head, and the much 

 heavier prothorax. The general faciès of the species is thus that of T. 

 pedicularhis Haliday and T, americaiius Hood. 



Cryptothrips junctus, sp. nov. — (PI. VH, fig. 1, a, b, c.) 



Female. — Forma brachyptera. Length about 1.7 mm. Surface 

 smooth, shining, anastomosing lines scarcely evident. Colour by reflected 

 light bright crimson red ; head and prothorax darkened with blackish 

 brown ; tube, legs and antennae nearly black. Colour by transmitted 

 light blackish brown ; the head, prothorax and abdomen with a nearly 

 continuous layer of bright crimson hypodermal pigment ; antennae dark 

 blackish brown, segments i and 2 and pedicel of 3 slightly paler ; legs 

 slightly paler than antenncC, non-pigmented, tarsi pale yellow. 



Head rectangular, about one and one-fifth times as wide as long ; 

 cheeks parallel, rounded very abruptly to eyes and slightly flaring at base ; 

 vertex rounded, slightly produced ; postocular bristles long, explanate and 

 divided at tip. Eyes small, flattened, protruding, anterior in position and 

 directed forward. Ocelli small, subapproximate, anterior, the posterior 

 far removed from the eyes. Antennae seven-segmented, with an oblique 

 suture at middle of ventral surface ; spines and sense cones long, slender ; 

 formula: 3, 1-2; 4, 2-2; 5, 1-1+^; 6, 1-1+^; 7, o-i. Mouth-cone 

 large, heavy, blunt ; maxillary palpi more than half the length of pronotum. 



