Aragiiapiche, 15 fm., August 26, 1958, Oregon 

 Sta. 2210. 2 S , ITSNM, off Boca Araguao, 9 to 10 

 fra., August 27, 1958, Oregon. Sta. 2215. 



TRINIDAD 



1 9 , rWI, Caroni Swamp, October 1965, P. E. 

 Hacon. 1 9 , USNM, Cocorite Swamp, August 31, 

 11)66, P. E. Bacon. 1 $ 2 9 , USNM, Maturin Bar, 

 (iulf of Paria, 6 fm., April 26, 1944, E. J. Wliite- 

 leather and H. H. Brown. 



GUYANA 



2 5 2 9, USNIVI, pond of Fisheries Laboratory, 

 Department of Agriculture, 1960, W. H. L. Allsop. 

 1 9 , USNM, off Guyana, 12 fm., May 30, 1957, 

 Coquette Sta. 155. 5^39, USNM, off Guyana, 



j 10 fm., March 25, 1963, Oregon Sta. 4306. 



SURINAM 



1 &, USNM, NE. of mouth of Surinam Eiver, 

 13 1/5 fm., June 11, 1957, Coquette Sta. 203. 1 9. 

 USNM, off mouth of Surinam Eiver, ISK fm., 

 June 11, 1957, Coquette Sta. 208. 1 cf, USNM, off 

 mouth of Surinam Eiver, 14?(o fm., June 28, 1957, 

 Coquette Sta. 293. 5 9, UMML, off Surinam, sum- 

 mer 1960, H. Lijding. 

 BRAZIL 



Para-Maranhao : 1 cf 2 9, USNM, Jime- 

 July 1965, P. Paiva. 



Maranhao: 1 cf 2 9, USNM, June 30, 1965, 

 J. Fausto Filho. 



Ceara: 2 cf 1 9, USNM, Fortaleza, April 6, 



1965, J. Fausto Filho. 



Pernambuco: 2 d' 2 9, USNM, Eecife, 

 August 10, 1964, P. Alves Coelho. 2 cf 1 9, 

 USNM, Eecife, H. von Ihering. 



Alagoas: 1 cf, USNM, Maceio, July 22, 

 1899, Branner-Agassiz Exped. 



Bahia: 1 cf 2 9, USNM, Mapelle, Hartt 

 Exped. 1 cf , YPM, Lagoon in Caravelas, Hartt 

 Exped. 17 cf 14 9, USNM, Taperoa, March 3, 



1966, E. Luz. 14 cf 1 9, USNM, Maragogipe, 

 1966, A. Barbosa de Oliveira. 



Sergipe: 4 cf 5 9, USNM, mouth of Agua 

 Azeda Eiver, Nossa Senhora do Socorro, March 9, 

 1966, do Condese. 



Espirito Santo: 1 cf 1 9, MNHNP, Villa 

 dAnchieta, November 30, 1961, Calypso Sta. 92. 



Rio de Janeiro: 2 cf 2 9, USNM, Baia de 

 Sepetiba, 1 fm., SUDEPE. 2 cf 1 9, USNM, 

 Eio de Janeiro, Ex. Museo Paulista. 1 cf , USNM, 

 Eio de Janeiro, H. von Ihering. 



Sao Paulo: 1 cf , USNM, Santos, 1949, J. de 

 P. Carvalho. 1 9, USNM, Santos, September 12, 



1925, W. L. Schmitt. 7 cf 12 9, USNM, Santos, 

 September 6, 1964, G. Vazzoler. 1 cf, USNM, 

 Santos, June 1913, H. Leuderwaldt. 2 cf 2 9, 

 USNM, Parol de Moela, October 29, 1964, G. 

 Vazzoler. 5 cf 4 9, USNM, Cananeia, September 

 1965, V. Sadowsky. 1 9, USNM, Cananeia, 

 November 1955, E. E. Boschi. 1 cf, USNM, 

 Cananeia, Mar do Cubatas, 1950, J. de P. 

 Carvalho. 



Parana: 2 9, USNM, Paranagua, 1965, W. 

 Eomanzini. 



Santa Catarina: 1 9, CPPSC, Arma5ao da 

 Piedade, January 3, 1965, E. Tremel. 



Diagnosis 



Adrostral carina and sulcus short, ending at 

 epigastric tooth. Petasma with inner surface of 

 distal portion of lateral lobe smooth, lacking diago- 

 nal ridge and fold, and with distoventral corner 

 produced, foi-ming subrectangular projection; 

 emargination median to inner lappet deep. Thely- 

 cum with pair of subparallel anterolateral almost 

 straight ridges followed posteriorly by two 

 rounded and rigid protuberances on sternite XIV ; 

 posterior margin of sternite XII bearing two 

 pairs of rather large projections. 



Description 



ROSTRUM (fig. 14) 



Teeth — — , mode — (percentage distribution: 

 'i— o 2 



8/2—55, 9/2—26, 7/2—15, 7/1—2, 8/1—1, 10/2— 

 0.66, 9/3—0.33; N=300) + epigastric; ventral 

 teeth relatively far apart, first tooth usually oppo- 

 site or anterior to last dorsal tooth ; rostrimi slen- 

 der and long, in juveniles extending to base of dis- 

 tal 14 of thickened portion of lateral antennular fla- 

 gellum; maximum length in relation to carapace 



r.l. 

 length obtained at 13 to 16 mm. c.l. (ratio 



c.l. 



as 



liigh as 0.95) ; decreasing progressively with in- 

 creasing length of shrimp, reaching distal end 

 of second antennular segment in shrimp 50 mm. 



c.l. (ratio -^ reduced to about 0.54) ; rostnun 

 c.l. 



straight, slightly concave postei-ovent rally; high- 

 est portion of blade usually at level of second, oc- 

 casionally of tliird dorsal tootli, and at level of 

 first tooth in some young; third dorsal tooth level 

 with anterior margin of carapace; tip slender 

 and long, almost one-half of length of rostrum. 



WESTERN ATLANTIC SHRIMPS OF GENUS PENAEUS 



489 



