NO. 2242. 



MORPHOLOGY OF THE 8TREF8IPTERA— PIERCE. 



433 



Parasites of the Scutellarid genus Ohrysocoris. 

 Type of the genus. — Chrysocorixenos siamensis, new species ; Siam ; 

 Ohrysocoris grandis Thunberg. 



1. CHRYSOCORIXENOS SIAMENSIS, new species. 

 Plate 68, fig. 1. 



Described from one female from a specimen of Ohrysocoris grandis 

 Thunberg, from Siam. 



Female. — Brood canal extends to apex of sixth segment and seg- 

 ments 2-6 have median unpaired genital tubes. Cephalothorax ap- 

 parently includes first abdominal segment with slight constriction at 

 base of thorax. Two pair of cephalothoracic spiracles. Head pro- 

 longed behind at sides. 



Table of measurements. 



Type.— C^t. No. 21437, U.S.N.M. 



V. Family MYRMECOLACIDAE Pierce. 



Tahle of Genera. 



Wings short in proportion to body, with eight primary veins ; fifth and sixth 

 antennal joints subclavate ; tenth dorsal abdominal segment small, not con- 

 cealing oedeagus and anal cavity : 9. Myrmecolax Westwood. 



Wings long, with only six primary veins from base, the cubitus and third anal 

 missing, with a short detached vein just below the apex of the radius, medius 

 short and continued by a long detached vein beginning behind it and shortly 

 before its apex; fifth and sixth antennal joints slender throughout; tenth 

 dorsal segment very large, completely covering oedaegus and anal cavity. 



10. Caenocholax Pierce. 



9. Genue MYRMECOLAX Westwood. 



1. 31. nietneri Westwood; parasite of formicid; Ceylon. 



10. Genus CAENOCHOLAX Pierce. 

 1. 0. fenyesi Pierce; host unknown; Mexico. 



1. CAENOCHOLAX FENYESI Pierce. 



Plate 69, figs. 1-3. 



Errata : Gen. Inser-t., p. 14, last line, add " PI. 1, unnumbei-ed figures" ; p. 52, 

 lines 14, 15, read " 4 " for " 3." 



The dorsal portions of the thorax of this species are adequately 

 described in previous papers, but a few points ought to be empha- 



3343— 19— Proc-.N.M.vc.l.54 29 



