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Pety et al. (2012) have reported the detection of eight transitions of aclosed-shell, linear molecule (B11244) in observations toward the HorseheadPDR, which they attribute to the $l$-C$_3$H$^+$ cation. Recent high-level\textit{ab initio} calculations have called this assignment into question; theanionic C$_3$H$^-$ molecule has been suggested as a more likely candidate.Here, we examine observations of the Horsehead PDR, Sgr B2(N), TMC-1, andIRC+10216 in the context of both $l$-C$_3$H$^+$ and C$_3$H$^-$. We find noobservational evidence of $K_a = 1$ lines which should be present were thecarrier indeed C$_3$H$^-$. Additionally, we find a strong anti-correlationbetween the presence of known molecular anions and B11244 in these regions.Finally, we discuss the formation and destruction chemistry of C$_3$H$^-$ inthe context of the physical conditions in the regions. Based on these results,we conclude there is little evidence to support the carrier is C$_3$H$^-$.

An observational investigation of the identity of B11244 ($l$-C$_3$H$^+$/C$_3$H$^-$)