8. LEPIDOJXEKNON. 461 



Syno2Jsis of the Sjjecies. 



I. Rostral separated from the frontal by the prsefrontals. 



A. First lower labial much larger than second. 



1, Two upper labials, first larger than second. 



Frontal as long as broad, or broader 



than long 1, microcepJialum, p. 462. 



Frontal longer than broad ; supraocu- 

 lar distinct 2. phocama, p. 4G3. 



Frontal longer than broad ; supraocu- 

 lar united with the praefrontal .... 3. strauchii, p. 463. 



2. Three upper labials, first smaller than second. 



Ocular separated from the third labial 



by a subocular 4. infraorhitale, p. 463. 



No subocular 5. rostratum, p. 404. 



B. First lower labial very small, second large. 



Frontal broader than long 6. 'p^^ersii, p. 464. 



Frontal small, longer than broad .... 7. polystegum, p. 464. 



II. Rostral in contact with the frontal. 



A. Frontal not, or but slightly, extending posteriorly beyond the 

 ocular. 



1. Frontal a little broader than 

 long ; parietals and occipitals 

 present ; head very uneven 

 with longitudinal and trans- 

 verse grooves 8. crassum, p. 465. 



2. Frontal longer than broad. 



a. No occipitals ; nine or ten 

 large elongate pectoral shields 



on a transverse line 9. wuchereri, p. 466. 



b. Occipitals distinct. 



a. Supraocular distinct. 



Frontal octagonal ; occipitals twice as 



broad as long ; three upper labials . lU. fjuentheri, 466. 

 Frontal octagonal; occipitals twice as 



broad as long; two ui)pcr labials . . 11. hoettgeri, p. 466. 

 Frontal hexagonal ; occipitals thrice as 



broad as long ; two upper labials . . 12. ajjinc, p. 467. 



jc3. Supraocular fused with the prajfrontal. 



Only the point of the frontal in con- 

 tact with the rostral ; first upper 

 labial twice as long as second .... 13, boidengeri, p. 467, 



