336 
a. Head and anterior portion of pronotum red . b. 
Head and anterior portion of pronotum not red oe c. 
b. Pygidium pubescent luteous-grey, with narrow brown mesial vitta Species No. 11. 
Pygidium rufescent-brown, with thin grey border Species No. 10. 
Pygidium sparsely grey, with white mesial vitta . . . . . ee Species No. 9. 
c, Pygidium densely pubescent-white or luteous-grey, without brown vitta . . d. 
Pygidium rufescent-brown, with white or grey mesial vitta or lateral border . e. 
d. Anal sternite rounded; pronotum longitudinally plicate Species No. 8. 
RHYNCHOPHORA. 
Key to the Central-American Species. 
1. Gymnognathus scalaris, sp.n. (Tab. XI. figg 
7 a.) 
Anal sternite strongly bidentate ; pronotum not plicate. . . . . . . . Species No. 7. 
. Lateral carina extending to apical fourth of prothorax ; pygidium with thin 
white mesial line . . . . Species No. 4. 
Lateral carina reaching to middle only f. 
Head with two luteous or white vitte. . . . . ... g- 
Head entirely luteous or white above. . ... . Lee oe a. 
. Frons with three carine ; fifth interspace of elytron subcostate before apical 
declivity. . 2. 2. 1. 2. 2 ee eee ee - + + « « « « Species No. 1. 
Frons multiplicate, with or without a well-defined mesial carina ; fifth inter- 
space of elytron not subcostate . . . h. 
. Pronotum irregularly plicate, with three isolated vittee . « . «. . Species No. 5. 
Pronotum not plicate; lateral vitta not separate from pubescence of underside 
exceptinmiddle . . . ... see Species No. 6. 
Basal fourth of suture of elytra rufescent-brown . . .. . Species No. 2. 
Suture grey from base to apical declivity . . . . . . . . . . . « Species No. 3. 
3 Q. In general appearance similar to G. ophiopsis, Dalm. (1833). A vi at Ooch side on rostrum and head; 
on pronotum a mesial vitta situated in a depression, gradually narrowing anteriorly, two small dots 
laterally, and an interrupted lateral vitta imperfectly separated from pubescence of under surface; on 
elytra a large sutural area extending from base, where it expands to the shoulders, to near apical declivity, 
bisinuate on each side and also sinuate at apex; a brown sub-basal spot within the area on each elytron ; 
suture and alternate stripes grey within the patch, or only the suture, three lateral spots, an elongate 
one below shoulder, another before and a third behind middle; a small oblique spot at apex near sutural 
angle; pygidium with thin,.abbreviated, lateral vitta; on underside, a stripe beneath eye, another on 
prosternum, sides of meso- and metasternum and of first three abdominal segments, and a lateral spot 
on fourth segment ; all these markings clayish-yellow. Rest of underside thinly pubescent-grey. 
Rostrum spatulate, twice as long as broad in middle, with mesial carina, which is accompanied on each side 
by another carina from middle of rostrum backwards. Third segment of antenna at least half as long 
again as first. Prothorax longer than broad, carina slightly concave, lateral angle obtuse, rounded ; 
basal longitudinal carina not quite the same in direction as lateral carina. Elytra strongly narrowing 
posteriorly, deeply depressed at suture, fifth interspace subcostate behind. Pygidium rounded, the angles 
feebly acuminate. Anal sternite strongly bidentate. 
ength 7-10 millim. 
Hab. Mexico, 'Toxpam (Sailé). 
One male ané two females: 
type, female. 
