Beetles of North Carolina
Family (Alpha):
Scientific Name: Common Name:
« »
View Carabidae Members:
Members of Trechus:
1 NC Records

Trechus hydropicus Horn, 1883 - No Common Name

Taxonomy
Family: Carabidae Subfamily: Trechinae                                                             
Comments: One of 82 species in this genus that have been recorded in North America north of Mexico, 42 of which occur in North Carolina (Bosquet, 2012). Trechus hyrdopicus belongs to subgenus Trechus and is included in the Hydropicus Species Group by Barr (1979, 1985). Other members of this group that occur in North Carolina are Trechus caliginis, schwarzi, mitchellensis, carolinae, and roanicus; Trechus cumberlandus is the only other member of this group and is restricted to the Cumberland Plateau in Kentucky and Tennessee.
Species Status: The type locality is "Virginia". This species contains four subspecies, with the nominate form found in Virginia, Maryland, West Virginia, and Maryland (Barr, 1962). Subspecies canus has been recoded in southwestern Viriginia and Kentucky (Barr, 1979, Bosquet, 2012) and both subspecies beutenmuelleri and avus are restricted to North Carolina (Barr, 1962, 1979; Bosquet, 2012).
Identification
Field Guide Descriptions: Online Resources: BugGuide, Wikipedia, GBIF   iNaturalistTechnical Description, Adults/Nymphs: Barr (1962, 1979)                                                              
Comments: Body and elytra dark, shining piceous; legs paler piceous (Barr, 1962). Generally, members of this genus show too little variation in pattern for standard photographs to be used to identify particular species.
Total Length [body plus wings; excludes ovipositor]: 2.7-4.4 mm (Barr, 1962)
Structural Features: As a member of subgenus Trechus, the first and second segments of front tarsus are both enlarged in males. This species is distinguished from other members of its species group morphometrically and by features of the aedeagus (Barr, 1962, 1979).
Distribution in North Carolina
County Map: Clicking on a county returns the records for the species in that county.
Flight Dates:
 High Mountains (HM) ≥
 4,000 ft.
 Low Mountains (LM) <
 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)
Click on graph to enlarge
Habitats and Life History
Habitats:
Diet:
Observation Methods:
Abundance/Frequency:
Adult Phenology:
Status in North Carolina
Natural Heritage Program Status:
Natural Heritage Program Ranks: GNR [S1S3]
State Protection:
Comments: The State Rank of S1S3 applies to the species as a whole, including the intergrade population recorded at Beech Mountain. This species has been well-studied and new populations are unlikely to be discovered. As with other members of this genus, warmer and dryer climates probably represent a major threat to this species.