Hymenopterous genus Scleroderma. 133 
THYNNUS. 
Fabr., Syst. Ent., p. 360. 
Thynnus picinus, n.s. (Plate VIL., fig. 5). 
?. Aptera, elongata, convexa, glabra, picea, antennis, 
pedibus, marginibusque posticis segmentorum abdomi- 
nalium magis testaceis; capite quadrato convexo, rude 
punctato; antennis (fig. 5a) brevibus crassis, 12-articu- 
latis, articulo 2ndo minimo; pronoto subquadrato punc- 
tato, angulis anticis rotundatis, metanoto angustiore 
supra plano, lateribus ad basin elevatis, disco ibi depresso 
punctato, abdomine elongato punctato, marginibus 
seementorum levioribus, segmento ultimo supra sub- 
carinato, et utrinque linea obliqua setarum brevium 
lutearum instructo, oviductu acutissimo brevi, e lobis 
duobus brevibus obtusis exeunte; pedibus brevibus 
robustis ; tibiis extus spinosis (fig. 5 b, hind leg). Long. 
corp. 4 lin. 
Hab. In Brasilia (D. Miers). In Mus. Hopeiano Oxonie. 
This insect has so much the general appearance of 
the females of Pristocera depressa and P. atra, above 
noticed, that I considered it to be congeneric therewith ; 
the 12-jomted antenne of the female and the structure 
of the legs remove it, however, to the Aculeata, and to the 
family Thynnide. I cannot, however, suggest the genus 
or subgenus of that family to which it belongs. 
MeEtTHOoCcA. 
Latr., H. N., xiii. 268. = Tengyra, Latr., males. 
Methoca ichnewmonordes. 
Latr.; Curtis, Brit. Ent., Pl. 329. 
M. articulata, Laty. olim in Journ. d’ Hist. Nat. et Phys. 
Mutilla formicaria, Jurine, Pl. XIII. 
Tengyra Sanvitali, Latr., fig. Westw., Ent. Text Book, 
PERL fie.'6. 
Methoca californica, n.s. (Plate VII., fig. 1.) 
2. Tota badio-castanea, nitidissima, glaberrima, con- 
vexa, capite thorace latiori subgloboso, antennis rectis, 
thorace vix longitudine zqualibus, fere filiformibus, arti- 
culis ultimis nigricantibus; collare ovali basi truncato; 
