BEMIPTERA HETEROPTEBA- I'll VS.\ roi )I!S. :;71 



Family PHYSAPODES Dum^ril. 

 These minute ilower iiiM-cis have been found in considerable numl"-i- 



in Tertiarv deposits. Ai\, ( ciiiii^i-n. Knit, and ainKer have each \ ielded 

 more than inn- species of Thrips, fifteen in all, of which nearlv half come 

 from Rott. lioiili s tlii- Rott lias furnished four species of 1 leliothrips ami 

 niic ut' Phloeothrips, while an extinct genus Calothripa is represented at Ai\ 

 liv a single species. In our o\vn country they have been detected only in 

 the White River Keds, where one species each of the genera Melanothrips, 

 Lithadothrips, and Palaeothripa have been found and are described beh>\\ : 

 the la-t t\\i> (if the genera are extinct. 



- 



MKLANOTIIRIPS Haliday. 



The onlv species of this genus that has been found fossil is the 

 descrilied lielo\v. So far as I know Melanothrips has not been observed 

 this country among recent insects, but only in Europe; but so little in 

 aiteiition ha.> lieen paid to our native species of Physapodes that thi^ i- ot 

 little significance. 



MELANOTHRIPS EXTINCTA. 



I'l. 5, Figs. 90, <1. 

 Melanolhrip* ertincta Scndd., Bull. U. S. Geol. Geo<;r. Surv. T.Tr., 1. .'-. I 1- 



Ilead small, tapering: the onlv appendages visilile are the anteii; 

 these are only siitlicientK pre>erved to recn^ni/e that they are very lon^- 

 and slender, longer than the thorax. The thorax is rather small, quadrate; 

 wini, r s nearlv as IOIIL:' as the Kodv. fringed on the costal border as in 1'ala-o- 

 thrips t'ossilis. The alidonn-n is compo>cd of only cii^ht joints, hut is \,T\ 

 lon- and very tapering, fusiform, the last joint produced, as usual in the 

 ph\sapods: the third joint is the broadest; of the wings only the c>tal 



l>order and a part of one ot' the longitudinal veins can be 866n ; there are 



no remain^ i <\ lc^-s. 



Lenuth of I.... Iv, 'I. _""": of antenn.-c. ii.s'-" ; of head, 0.14 : of thorax. 



: of abdomen, . greatesl l.i-eadth ..fal.d m, n ". 



< 'ha^rin \'alle\'. \\'hite River, ( 'olorado. ( >IH- sjiecimi-n. \\' I lenlon 



