1885.] -jUJ [Meinert. 



I have seen only one specimen, which was labeled " Opisthe- 

 mega postica Wood," and is among the large number of Myria- 

 pods, which are designated as " types determined and described 

 by Dr. H. Wood in his Myriapods of N. America"; but a little 

 note was attached to this species : " the original catal. says spini- 

 cauda," and actually it is to be referred to Opisthemega spini- 

 cauda Wood and not to Op. postica Wood. 



Hab. Acapulco, Mexico, Mr. A. Agassiz. 



2. Opisthemega crassipes, n. sp. 



Rufo-brunneum, subtus pallidius, pedibus antennisque flavis ; minus vel 

 sat crassum, sparse leviter punctatum, annulo ultimo pedibnsque analibus 

 densius, grossing punctatis lamina dorsali prima ante angulatim sulcata, 

 laminis ventralibus sulco longitudinal! atque transversal! cruciatim ex- 

 aratis; capite subovali. Antennae longiusculae tenuisculse, paulum attenu- 

 ata% 17- vel 18-articulatse, prater latus superius articulorum quaternorum 

 priorum, densius brevius hirsutae, articulis plurimis longiusculis. 



Dentes prosternales bini vel terni, majores ; dens coxalis parvus acutius- 

 culus. 



Pedum tibia articulisque primus tarsal is, pedibus articis binisque pos- 

 terioribus exceptis, calcare armati. 



Pedes anales perbreves, percrassi, contigui, adapti, deplanati, rnargine 

 sup. interiore et inf. interiore carinatis, femore inermi. 



Laminae dorsales prater ultimam immargiuatae. 



Pleurae posticas angustae, sublseves, porosae, post late sinuata?, inermes. 



Lamina ultima ventralis longa, lata, lateribus parum sinuatis, valde 

 angustata, post rotundate truncata. 



Long. 36 mm. 



Hab. Jacksonville, Fla., J. A. Allen; St. Johns river, Fla. ; 

 Pennington's Gap, Lee Co., Va. ; Bee Spring, Ky., F. Gr. San- 

 born. 



3. Opisthemega insui^are, n. sp. 



Flavum vel ochraceum, ante et post rufescens ; sat gracile, sublaeve, 

 lamina ultima dorsali pedibusque analibus sparse leviter punctatis, lamina 

 dorsali prima ante in formam ypsili sulcata, laminis ventralibus sulco longi- 

 tudinali profundo foveam median} secante exaratis ; capite subovali. An- 

 tenna? breviuscuke, paulum crassiuscuhe, attenuata?, 17 articulatae, ad 

 apicem sparsius, brevissime hirsutaa, articulis mediis longiusculis. 



Dentes prosternalis bini vel terni, parvi ; dens coxalis perparvus, ob- 

 tusus. 



Pedum tibia articulusque primus tarsalis, tibia pedum primorum pedi- 

 busque binis posterioribus exceptis, calcare armata. 



PROC. AMER. PHILOS. S0C. XXIII. 122. 2A. PRINTED DECEMBER 31, 1885. 



