36 PROCEEDINQS OF THE tfATIONAL MUSEUM. vol. 46. 



ocelli present, the anterior one directed forward; antennae inserted 

 below the eyes, twice as long as the head, eight-segmented, style 

 two-segmented, intermediate segments scarcely elongated; mouth 

 cone reaching past base of prosternum, narrowing sharply just 

 below maxillary palpi, very sharply pomted; maxillary palpi of 

 medium size, the first segment very short, the second segment tipped 

 with two long, slender hairs; labial palpi nearly or quite as long as 

 the maxillary, the first segment being about four times as long as 

 the first segment of the maxillary palpi. Prothorax stout, trape- 

 zoidal, slightly longer than the head, through the coxae more than 

 one and one-half times as broad as long, all of the usual spines present. 

 Mesothorax broadest of thoracic segments, sides of meso- and meta- 

 thorax nearly straight, converging slightly to juncture with abdomen. 

 Wings of medium size, not constricted in the middle, margins nearly 

 parallel to the apical thu-d whence the hind margin curves forward 

 broadly. Middle and hind legs of medium size and length, fore 

 femora greatly thickened, nearly as broad as the head, fore tarsus 

 armed with a long, stout tooth. Abdomen stout, slightly wider 

 than the mesothorax; tube stout, about twice as long as the pre- 

 ceding segment. 



Generic description drawn up from three females, one winged 

 and two wingless. 



This genus is apparently closely related to Cryptothrips, but differs 

 from it in having the femora of the females greatly enlarged and 

 armed, in having the labial palpi as long as the maxillary palpi, 

 in having the wings not narrowed in their first half, and in having 

 the mouth cone long and sharply pointed. 



Tyi^e of the genus. — HoristoiJirips australise. 



HORISTOTHRIPS AUSTRALIA, new species. 



Figs. 68-71. 



Female.— Length of winged form 2.75 mm., length of wingless form 

 2.41. General color dark brown. 



Head, length 0.28 mm., width 0.21; sides, almost straight— very 

 slightly convex — and very shghtly constricted posteriorly. Entire 

 dorsum finely areolate — very nearly reticulate; cheeks bear a few 

 tiny spines similar in size to those scattered upon the dorsum. Post 

 ocular bristles prominent and with dilated tips. Eyes finely facetted, 

 occupying slightly more than half the width of the head and nearly 

 one-third the length, pale yellow, almost white. Front truncate 

 across the eyes, antennae inserted below the front which is slightly 

 produced at that point between the basal joints. Ocelh present, 

 posterior pair situated on a hne with center of eyes and contiguous to 

 them. Anterior ocellus at extremity of front and directed forward. 



