1862.] dr. w, baird on new entozoa. 113 



2. On Two New Species of Tyrant-birds from Ecuador. 

 By p. L. Sclater, M.A., Ph.D., F.R.S., Secretary to 

 the Society. 



I am indebted to Mr. Gould's kindness for two specimens of Ty- 

 rant-birds from a collection recently received by him from the high- 

 lands of Ecuador. They are of nearly allied species, but stand best 

 in the two neighbouring sections of Ochtho'eca and Mecocei'culus. 

 By the latter name I propose to replace Myiarchus (Bp., nee Cab.), 

 using it as a generic title for Fluvicola leucophrys, Lafr. et D'Orb., 

 and its allies. 



1. Ochthoeca citrinifrons. 



Obscure cinerea, dorso postico rufescente : fronte distincte citrino- 

 Jlava : superciliis elongatis, albescentibus ; alls caudaque nigri- 

 cantibus, illarum marginibus externis rufescentibus : subtus om- 

 nino pallide ci7iereus : rostro et pedibus rdgris. 

 Long, tota 4vo, alee 2' 5, caudae 2*25 poll. Angl. et dec. 

 Hab. In rep. Equator. 

 Mus. P. L. S. 



Obs. Affinis OchthoeccB albidiemati, Lafr., sed fronte citrina facile 

 dignoscenda. 



2. Mecocerculus gratiosus. 



Rufescenti-olivaceus, pileo fusco : fronte distincta et superciliis 

 elongatis aureis : alis fusco-nigris, tectricum utrinque et se- 

 cundariorum marginibus externis rufescentibus : cauda fusco- 

 nigra : subtus olivaceus, ventre medio flavo : rostro et pedibus 

 nigris. 



Long, tota 4*5, alse 2-.'), caudse 2*2. 



Hab. In rep. jEquator. 



Mus. P. L. S. 



Obs. Affinis Mecocerculo diademati, sed rostro breviore, alis paulo 

 brevioribus, et harum tectricibus rufescente bifasciatis distinctus. 



3. Description of some New Species of Entozoa. 

 By W. Baird, M.D., F.L.S., etc. 



1. AscARis uNDULoso-sTRiATA, Baird. 



Head naked, with well-marked, roundish labial lobes. Body of a 

 white colour, with a well-defined line running longitudinally through 

 its whole length ; smooth, but finely wavedly striated longitudinally, 

 instead of transversely. The greatest diameter is at the anterior extre- 

 mity, the body tapering gradually towards the tail, and terminating 

 in a finely subulate point. In the female this point is long, and 

 gradually becomes very fine ; in the male the body, posteriorly to 

 the opening from which issue the male organs or spicula, suddenly 

 contracts and tapers quickly to a very sharp subulate point. The 



Proc. Zool. Soc — 1862, No. VIII. 



