no INSKCUTOR INSClTl.lv MENSTRUUS 



A NEW PHYSOTHRIPS FROM WESTERN AFRICA 



(Thysiinoftera) 



Bv J. DOUGLAS HOOD 

 Physothrips ventralis, new species. 



Female (macropterous). — Length about 1.1 mm. Color 

 blackish brown, with knees, apices of tibise, tarsi, and third 

 antennal segment yellowish ; ocellar and thoracic pigmentation 

 orange-red ; wings uniform dark grayish brown. Head about 

 1 .;' times as wide as long, cheeks slightly rounded ; interocellar 

 bristles fully one-third the length of head. Eyes about 0.(i5 

 as long as head. Antenna^ about 3.1 times as long as head, 

 blackish brown, segment ',] grayish yellow. Prothorax very 

 slightly shorter than head and 1 .5 times as wide as long, trans- 

 versely striate, bristles at posterior angles five-eighths the 

 length of pronotum. Anterior vein of fore wing with 3 -f 5 

 spines near base and two near tip. Abdomen without sculpture ; 

 comb on segment 8 continuous; segment 10 divided above in 

 apical half. 



Measurements: Length LI 2 mm.; head, length, O.Ll"? mm., 

 width 0.149 mm.; prothorax, length, 0J28 mm., width 0.193 

 mm.; pterothorax, width 0.2")0 mm.; abdomen, width, 0.312 

 mm. Antennal segments: 1, 24|i ; 2, 3.5[i ; 3, 53^; 4, 52|.i; 5, 

 39n; 6, 50(1 ; 7, 9^ ; 8, IHji; total length of antenna, 0.278 mm.; 

 width at segment 3, 53fi. 



Male (macropterous). — Length about 0.8 mm. Sternites 

 3-7 each with two nearly regular transverse rows of from 

 5 to 9 circular pale areas. Ninth tergite without distinct 

 armature. 



Described from numerous specimens of both sexes collected 

 from a large variety of fiowers in Kamerun and at Ibadan, 

 Southern Nigeria, in 19i:) and 191(1. by Lieut. Arthur W. 

 Jobbins-Pomeroy. 



The male characters separate it readily from funtumice. 



Date of publication, April 10. 1918. 



