1877.] COLLECTION MADE BY H.M.S, ‘PETEREL.’ 83 
1, Camponotus sENEX, Smith, Cat. Hymenopt. part vi. p. 47. 
From Charles Island (W. E. Cookson). 
2. CAMPONOTUS PLANUS. 
Worker. Length, 12 line. Black, with the legs, antennee, and 
mandibles ferruginous; thinly sprinkled with pale glittering hairs. 
Head slightly shining, oblong, a little wider than the thorax, with 
the eyes prominent and situated high at the sides near the vertex. 
Thorax rounded anteriorly, flattened above, and gradually narrowed 
to the metathorax, which is truncate behind ; the sutures dividing 
the pro-, meso-, and metathorax only slightly impressed. Abdomen 
ovate, semiopaque ; the node of the petiole incrassate, narrow, the 
sides nearly parallel, rounded above. 
Charles Island (C. Darwin). 
3. CAMPONOTUS MACILENTUS. 
Worker. Length, 27 lines. Pale ferruginous, with the legs pale 
testaceous, smooth and shining, and having a few erect scattered 
pale hairs. The head wider than the thorax, oblong, with the eyes 
large, ovate, and black; the vertex slightly emarginate behind. 
Thorax compressed and much narrowed behind, convex above. 
Abdomen wider than the head, and oblong-ovate. The scale of the 
petiole wedge-shaped and rounded above. 
Charles Island (C. Darwin). 
4. AGRIOMYIA VAGANS. 
Female. Length 2 lines. Head and thorax rufo-piceous; abdo- 
men pale ferruginous, smooth and shining. Head oblong, the vertex 
rounded behind ; the mandibles and antennze paler than the head. 
Thorax a little longer than the head, deeply strangulated between 
the pro- and metathorax; the former rounded in front and very 
convex; the metathorax abruptly truncated obliquely ; the legs 
rufo-piceous, with the tarsi and the articulations pale testaceous ; 
the tibiee paler than the femora and spinose exteriorly. Abdomen 
oblong, cylindric, and one third longer than the head and thorax, 
mottled with dark rufo-piceous stains; the second segment with 
three or four transverse impressed lines; the apex acute. 
On comparing this insect with females of the different genera into 
which the genus Thynnus has been divided, it appears from its general 
structure to belong to the genus Agriomyta of Guérin. 
Charles Island (C. Darwin). 
5. XyLOcoPpA MORDAX, Smith, Trans. Ent. Soc. Lond. 1874, 
p- 294, 2. 
Male. Length 8 lines. Ochraceous, the ocelli and mandibles 
black, the latter with a yellow spot at their base; the clypeus with 
a rufo-fuscous longitudinal line in the middle ; the antennz fuscous 
above ; the pubescence fulvous. The mesothorax smooth and shining 
on the disk, as is also the scutellum ; both nearly impunctate, having 
only a few very fine punctures: the mesothorax blackish on each 
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