96 {May ) 
b. Capite rotundato, occipite breviter impresso, thorace postice constricto, 
elytris basi impressis. ua Sp. 4—6. 
c. Capite rotundato, occipite non impresso, thorace postice modice constricto, 
elytris non lmpressis: corpus minus pubescens. Sp. 7—9. 
d. Capite Su Ace thorace elongato, trapezoideo ; corpus vix pubescens. 
Sp. 10—13. 
e. Capite sae aN thorace plus minusve trapezoideo, elyants non HAP ey 
sis; corpus longius pubescens. 
1. Capite postice rotundato, thorace subcampanulato; antennis tenuibus. 
Sp. 14—18. 
2. Capite postice truncato, pone oculos non angustato, oculis prominulis. 
, S 
Sp- 19—36.. 
3. Capite postice truncato, pone oculos non angustato, oculis parvis ; 
elytris lateribus rotundatis, humeris fere nullis. Sp. 37. 
B. Caput non granulatum; tibie calcaribus obsoletis; thorax basi non 
marginatus. Sp. 38. 
C.. Caput triangulare, granulatum; tibie calcaribus valde. distinctis: 
thorax ovatus basi marginatus. Sp. 39—4v. 
1. A. obscurus, niger nitidus subtiliter pubescens, capite impunctato, 
thorace postice constricto, basi cylindrico, elytris parcius punctulatis, versus 
basin vix cinerascentibus, antennarum basi pines Long. :12. 
Ferté, Anthic. 116. 
Coney Island, near New York. July, in salt marsh. The elytra are less 
impressed behind the base than in the following. ‘The posterior tibie of the 
male are not dilated, or bent. 
& 
2, A. nitidulus, niger nitidus, subtiliter pubescens, capite parce punc- 
tato, thorace postice constricto, basi cylindrico, elytris parce punctulatis, basi 
vix cinerascentibus, antennarum basi picea. Long. °12. 
Lec. An. Lyc. 5, 153. 
Two specimens, San José, California. Exactly similar in size and form to 
the preceding, but differs by the head being punctured, and the elytra more 
deeply impressed towards the base. 
3. A. elegans, rufo-piceus, subtiliter pubescens,capite vix punctato, thorace 
postice constricto, basi cylindrico, elytris punctulatis, nigris, basi indeterminate 
rufis, et cinerascentibus. Long. +12. 
Ferté, Anthic. 117. 
Georgia and Missouri Territory. I have always considered this species 
as A. cinctus Say, but, after renewed investigation, feel inclined to 
adopt Ferté’s conclusion, that Say’s species is more allied to A. formicarius. 
The expression ‘ elytra hirsute ’? will by no means apply to the present species, 
nor is there ever a cinereous spot at the tip of the elytra. The male has the 
posterior tibie dilated and sinuated internally. 
4. A. tenuis, niger opacus, tenuiter pubescens, capite dense punctulato, 
occipite breviter canaliculato, thorace postice constricto, basi cylindrico, elytris 
vix impressis subtilissime punctulatis, fascia ante medium angusta albida, 
antennis palpis pedibusque testacis. Long. -12. 
Lec. An. Lye. 5, 153. 
Colorado River, California. Approaches very close to the preceding species 
in form, but the last joint of the palpiis longer than wide. The anterior part of 
the thorax is less globose than in A. formicarius, with which, however, it agrees 
so closely in the form of the body and structure of the palpi, that it would be 
a 
