l'A.M. PlinKlD.i: j2 



FniMle. Uuth wiiiKS aii.l haltercs ahscnt, eyt-s imuji reducfd. ocflli piescnt rhora.x small, 

 .oun.lcd whcn sccn tr,.m thc sule. iiansvcrsc when seen from above, two orthree times as wide as \ong. 

 Abdoincn elliptical, tirst four dorsal se-ments strongly chitinized, coverim^ tho greater part of the 

 dorsiim nf thc ai).l(imeii. Legs stouter than in tiic' nialc. 



Type specJes : /'. Iiifi/na, Hahl. 



Geographical dlstribution of species. - Some hve specics are refeiablc to this -rcnus 

 occurrm.n "i wi<icly sepniatcd localities. ^" 



i. P. C;)^.xemfta. Bcckcr, Abh. Zool.-bot. (ies. VVien, \(,1. i, p. 47 ( 1901) ( luiiope) 

 z. P. luciftra, Dahl, Sitzb. d. Naturf. Freunde, p. i85 (1898) (Bismark Archipelagoi. - Plate 2 Fiff 16 

 AW/;o/.„M«i ,nv//«/«.«, WantloUeck, Zool. Jahrb. Aljth f. Syst. Vol. 11. ,.. .,24 (i8.iS, ' 



3. P. occiikiilalis, Melander & Brues, Biol. BuU. \ .)1. 5, p. 17 (1903) (U. S. A.). 



4. P. tule.x. Dahl. Sitzb. d. Xatuif. 1-reundc. p. iSt, 11.S98) (Bismark Archipelago) 

 3, l\ veiiata. AldiKh. Trans. ICnl. S(,c. L„nd. p. ^ib (i8g6) (West Indies). 



18. Genus ECITOMYIA, Brues 



Ecitomyia. liriies. Thc .Amcr. Xatur. \'.>1. i5>. p. 347 (u,oi). 



Characters. - Male. Small, rather slcndcr specH>s. llcad somcwhat Hattcned, with large 

 antennal caviucs. Third joint oi antenna- spherical, aiista apical. Anteiior frontal bristlcs porrect 

 Front broader than I.,ng. with threc transverse lows of inacrochaeta> besides the four antenor bristles 

 Proboscis mnch shorter than the head, palp, biistly. Thora.v with dorsocentral and scutellar bnstles 

 W mgs largc. with only a singlc heavy vein, th.- tinr.l. which is simple at th.- t,p. Costa with tine setx., 

 only three light \eins present. Legs long and slender, not setulose. 



Female. Eycs reduced in size, no larger than the antenna.; ocell, absent. Thoracc dorsum in one 

 Piccc. ihe scutellnm being absent. x^ith a single pair „f dorsocential bristles. Wings vestigial, reduced 

 .0 flmgershaped appendages which arc n„ longer than thc mes..notnm. Abd.,men membranous cxcept 

 ior small dorsal plates. Fifth segment with a gland opening. Legs stoutcr than ,n the male, bare cxcept 

 for vcrv .Ipli.ale sj.urs on the four ],osterior tibi;c. 



Geographical distribution of species. - But a single species is known. 

 I. E. WliecUn, J^rucs, Thc.\mc,. Xatu,. \-„l. J5, p. 347 (,901) ,U. S. A.. Texas). - Plate 2, Fig. I I . 



19. Genus ACONTISTOPTERA, Brues 



Acontistoptera. Br„es, The Amer. Xatur. \o\. .5,,, ,,. 37^ ,;iqo2). 



Characters. - Feniale uiiale unknown.. Hcad very b.oad, more than one and one half times 

 wide as thc thorax. widest at the fronl angles; half as long as wide : seen from above ,t is regularly 

 aicuate in front and concavc behind. iMont angles of head sharp, hind oncs rounded. Upper surfacc of 

 head with a small median pair of macrochaeta., eight marginal ones on the lateral and posterior edges, 

 one over each cye, a cluster at front angles and a regular series of closelv placed ones along the front, 

 between thc antenna.. l^>ont prolonged over the deep antennal cavitv. Thoiax sinall, greatly narrowed 

 beh.nd. the pleura. partly visible from above. Doisocentrals and scutellar brisdes present. Legs lather 

 slender. spurs of four posterior tibia^ well developed. Wings vcr^- short, about the length of the thorax. 

 At the middle the costal bristles suddcnly enlarge to form cnormous macr.,chacta^ some „f which are 



