Genus Hydaticus. PA 
collection, and to whose courteous liberality I am much indebted 
for assistance in my entomological researches. 
In the cabinets also of the British Museum, and R. Bake- 
well, Esq. 
2. H. bihamatus (Esch. Dej. Cat.); Aubé (Spec. Gen. 174). 
This species is the same as H. Goryi, Aubé (Spec. Gen. L75), 
and also is identical with //. scriptus of Blanchard in Homb. et 
Jacq. ;* the insect has a very extended range, being found in the 
Philippine Islands (whence I have received it from Mr. Thorey), 
in Aru (taken by Mr. Wallace), New Holland, Moreton Bay 
(received at different times by Mr. Stevens), Amboina, in New 
Guinea, Batchian and Ceylon. I have also a fine series of the 
insect taken by the late lamented M. Mouhot, in Cambodia, in 
which the flavous markings are almost entirely absent. 
3. H. Adamsii, n. sp. 
Laté ovatus, satis rotundatus, medio dilatatus, fusco-cinereus, 
flavo-irroratus: capite flavo, ad basin transversé nigro, etiam- 
que apud medium macula angulata litteram V_ formanti; 
thorace flavo, antice tenuiter et ad basin latius nigro-margi- 
nato; scutello nigro; elytris latis, nigris, levibus, nitidis ; 
undique punctorum tres series apparent, puncta ipsa rara, 
haud profunda, aliquando (et presertim serie &* ad mar- 
ginem) obsoleta; elytra multitudine macularum minutarum 
irrorata sunt; macule conferte, flava, juxta latera et basin 
confluentes ; margines ipsi flavi, sutura tenuiter nigra ap- 
paret: corpore sublus nigro; pedibus rufo- vel fusco-flavis, 
tarsis tibiisque posticis nigris ; antennis rufis. 
Long. corp. lin. 63; lat. lin. 4. 
A species which at first sight reminds us of the European 
species /, bilineatus, De Geer; but while in general pattern it 
exactly resembles this species, it is entirely distinct: in size it is 
much shorter (63 lin. instead of 7 lin.), the head is less produced, 
the apical margination is narrower and the basal broader, and the 
underside is black instead of rufo-flavous, 
I received this form with other interesting species from Mr. 
Adams, who took two specimens of it on the coast of China. I 
* T believe that H. pacificus also of M. Aubé (Spec. Gen. 177) will ultimately 
prove to be but a variety of it. I have in my cabinet one or two examples of 
H, bihamatus, which almost accurately agree with his description of H. pacificus, 
