Brachinus sp. (Bombardier Beetle).
 
 
 
Size: approx. 12 mm. Photo: 04/21/15, 10 pm.


Bombardier beetles have developed a chemical defense mechanism against predators. They can eject a foul-smelling, toxic gas from their abdomen. The gas is composed of hydrogen peroxide, hydroquinone, and catalytic enzymes. The ejection creates a loud popping sound. The larvae of the bombardier beetle are parasitoids of aquatic beetle pupae and scavenge body of host after its death  
 
 
bug guide (this photo):
http://bugguide.net/node/view/1058560
wikipedia:
http://en.wikipedia.org/wiki/Bombardier_beetle


Dicaelus sp..
 
 
 
Size: approx. 20 mm. Photo: 06/26/14, 7 pm.


A Notched-mouth Ground Beetle: Dicaelus subgenus Paradicaelus. There are seven species (arranged into three groups), which all can be found in the US. These beetles apparently feed on snails. 
 
 
bug guide (this photo):
http://bugguide.net/node/view/945514


Lebia viridis.
 
 
 
Size: approx. 6 mm. Photo: 04/28/16, 10 pm.


This Colorful Foliage Ground Beetle is Lebia viridis. The species is wide spread, common, and shiny. The beetles are predatory on small insects.  
 
 
bug guide (this photo):
http://bugguide.net/node/view/1216501


Loxandrus sp..
 
 
 
Photo: 04/07/15, 9 pm.


This ground beetle loves damp conditions such as the leaf litter in moist forests and areas that are subject to seasonal flooding and have extensive standing water. Loxandrus comes to light sources and has characteristic bulging eyes. For North America, the genus includes 44 species and many more worldwide. 
 
 
bug guide (this photo):
http://bugguide.net/node/view/1053753


Pentagonica flavipes.
 
 
 
Photo: 04/04/17, 10 pm.


This species seems to live in the Southeastern states and the Caribbean. It was also introduced accidentally to the Galapagos Islands. The second link states: "Bell (1985) remarked that what we call Pentagonica flavipes may actually be 'a complex of sibling species, differing only in the form of the male genitalia.' These beetles are regular visitors to lights."  
 
 
bug guide (this photo):
http://bugguide.net/node/view/1353319
American Insects:
http://www.americaninsects.net/b/pentagonica-flavipes.html


Stenolophus ochropezus (Seedcorn Beetle).
 
 
 
Photo: 03/16/16, 9 pm.


The US is home to 32 Stenolophus species. This specimen was clearly attracted to our outdoor lights. 
 
 
bug guide (this photo):
http://bugguide.net/node/view/1200590


Tetragonoderus intersectus.
 
 
 
Size: approx. 8 mm. Photo: 06/12/12, 11 pm.


This ground beetle is Tetragonoderus intersectus. It can be found in the Southeast and Texas and seems to prefer sandy locations such as river banks. The six local species in this genus hunt at night and are attracted by lights.  
 
 
bug guide (this photo):
http://bugguide.net/node/view/656431