Pupal cases of Nearctic robber flies (Diptera: Asilidae) Author Dennis, D. Steve Author Barnes, Jeffrey K. Author Knutson, Lloyd text Zootaxa 2008 2008-09-03 1868 1 1 98 https://biotaxa.org/Zootaxa/article/view/zootaxa.1868.1.1 journal article 10.11646/zootaxa.1868.1.1 1175­5334 5133591 Key to known pupal cases of Nearctic species of Heteropogon 1 Proboscial sheath without tubercles posteriorly; apex of maxillary sheath with small palpal sheath near juncture with proboscial sheath; posterior mesothoracic spine present; thorax lacking dorsolateral bristlelike spines; abdominal segment 1 with dorsal transverse row of 12–13 recurved spurs, median pair short, outer spurs often shorter than inner spurs; abdominal segment 7 with 6 long spurs alternating with 1–4 short spines; segment 8 with 2 dorsal spurs on each side of midline ...... Heteropogon macerinus (Walker) ­ Proboscial sheath with minute tubercles posteriorly on each side of median furrow; maxillary sheath without tubercle; posterior mesothoracic tubercle lacking spine, with 2 long, curved bristle­like spines; thorax dorsolaterally with 2 long, curved, median bristles; abdominal segment 1 with dorsal transverse row of 17 apically recurved spurs, dorsolateral and middle spurs shorter; abdominal segment 7 with 6 long spurs, spines absent; abdominal segment 8 with pair of long dorsomedian spurs...... Heteropogon wilcoxi James