66 U. S. P. II. R. EXP. AND SURVEYS ZOOLOSY 47TH PARALLEL. 



served, and I cannot, therefore, know whether the antennee 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 tuberculato, elytris thorace plus sesqui latioribus, parce punctatis 

 versus basin scabris, 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. 



DON ACT A Fabr. 



D. pyritosa, elongata, cupreo-zenea, capite non toroso, thorace confertissime rugoso, postice 

 haud angustato, angulis omnibus subprominulis, canaliculato ante basin transversim impresso, 

 tuberculo laterali, parvo, distincto, parurn prominulo ; elytris convexis parallelis, dense rugosis, 

 punctato-striatis, vage biimpressis postice rotundatis ; antennis fusco-nigris, crassiusculis, 

 articulis 2 4 sensim longioribus, feinoribus posticis clente acuto armatis ; pedibus ferrugineis, 

 femoribus ad apicem infuscatis. Long. 32. 



One specimen, Shoal water Bay ; Dr. Cooper. Closely resembles D. pusilla, but 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 

 tuberculatis, utrinque constricto, antrorsum subangustato ; 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 obscurioribus confertim punctatis, hoc latitudine 

 vix breviore lateribus medio obtuse tuberculatis, 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, chalybea nitida, thorace antrorsum valde angustato, lateribus 

 rotundatis depressis, medio valde convexo, subtilissime, lateribus fortius punctulatis, ad basin 

 marginato bisinuato, medio late subtruncato, elytris subconfuse punctato-striatis, macula 

 magna humerali rufa ornatis ; subtus pygidioque cinereo-pruinosis. Long. 3. 



A fine and large species found in Oregon and California. 



