66 
U. S. P. II. R. EXP. AND SURVEYS—ZOOLOQY-47TH PARALLEL. 
served, and I cannot, therefore, know whether the antennas are black or annulated. The black 
spots are very small, those of the elytra are in the usual position, and, with the exception of 
the humeral one, disappear in many specimens. 
Mesosa Serv. 
M. Guexi, atra dense breviter cinereo-pubescens, thorace parce pnnctato antice modice con- 
stricto, lateribus breviter tuherculato, elytris thorace plus sesqui latioribus, parce punctatis 
versus basin scahris, maculis duabus transversis undulatis nigris utrinque ornatis, antennis 
annulatis. Long. ‘8. Tab. II, Fig. 16. 
Lee. Journ. Acad. Nat. Sc. 2d ser. 2, 166. 
A female found by me, at Benicia, and two males collected by Dr. Heermann, in California. 
The male has longer and more hairy antennae, and the elytra slightly narrowed behind the 
humeri. 
Donacia Fabr. 
D. pyritosa , elongata, cupreo-asnea, capite non toroso, thorace confertissime rugoso, postice 
haud angustato, angulis omnibus subprominulis, canaliculato ante basin transversim impresso, 
tuberculo laterali, parvo, distincto, parum prominulo; elytris convexis parallelis, dense rugosis, 
punctato-striatis, vage hiimpressis postice rotundatis ; antennis fusco-nigris, crassiusculis, 
articulis 2—4 sensim longioribus, femoribus posticis dente acuto armatis ; pedibus ferrugineis, 
femoribus ad apicem infuscatis. Long. ‘32. 
One specimen, Shoalwater Bay ; Dr. Cooper. Closely resembles D. pusilla, hut the thorax 
is not narrowed behind ; the anterior lateral tubercles are smaller and less prominent; the 
elytra are broader and more finely rugous. 
Syneta Esch. 
S. albida, pallida elongata, capite thoraceque grosse punctatis, hoc lateribus medio acute 
tuherculatis, utrinque constricto, antrorsum suhangustato ; elytris confertim seriatim punctatis, 
costa dorsali obsoleta alteraque a humero ad apicem extensa. Long. - 28. 
Oregon ; Mr. Townsend and Dr. Suckley. 
S. simplex, testacea, capite thoraceque paulo ohscuriorihus confertim punctatis, hoc latitudine 
vix breviore lateribus medio obtuse tuherculatis, utrinque modice constricto, elytris fortius vix 
ordinatim punctatis, costa parum elevata a humero extensa postice obsoleta ; antennis obscuris 
ad basin pallidis. Long. ‘27. 
Steilacoom, Dr. Suckley ; one specimen. 
Saxinis Lac. 
S. saucia, ovata convexa, chalyhea nitida, thorace antrorsum valde angustato, lateribus 
rotundatis depressis, medio valde convexo, suhtilissime, lateribus fortius punctulatis, ad basin 
marginato bisinuato, medio late subtruncato, elytris subconfuse ^punctato-striatis, macula 
magna humerali rufa ornatis ; suhtus pygidioque cinereo-pruinosis. Long. ’3. 
A fine and large species found in Oregon and California. 
