The psyllids (Hemiptera: Psylloidea) of Florida: newly established and rarely collected taxa and checklist Halbert, Susan E. Burckhardt, Daniel Insecta Mundi 2020 2020-09-25 2020 788 1 88 55MWP Crawford, 1914 Crawford 1914 [194,692,1793,1822] Insecta Aphalaridae Tetragonocephala Animalia Hemiptera 24 23 Arthropoda species flava  ( Fig. 90, 91)   Materials examined. USA: Florida: Specimens from Alachua, Miami-Dade, and Volusiacounties ( FSCA, dry mounted, ethanol, envelope with dried leaves and lerps).   Diagnosis.  Tetragonocephala flavacan be recognized by the lerps on  Celtisleaves ( Fig. 91). Lerps are clam shell shaped and open on the side. They are attached to the undersides of the leaves, often near forks in the leaf veins. Adults resemble the more common  Pachypsyllaspecies, but they are pale and have six dark spots on the mesonotum and one at the posterior tip of the scutellum ( Fig. 90).   Distribution.  Tetragonocephala flavawas described from the southern tip of Texas and is known from Mexico( Ouvrard 2020). Its long presence in Florida, lack of serious damage to hosts, and the presence of a native parasite suggests that it is native to Florida. However, it possibly is adventive in Louisiana, where there was an outbreak that caused serious damage to the trees ( Solomon et al. 1997).   Floridadistribution information.  Tetragonocephala flavawas recognized in Floridafor the first time in April 1997on  Celtis laevigataWilld.in Oak Hill (Volusia County) (FSCA# E1997-1214) ( Halbert 1997b). Collectors were Avas Hamon, Ru Nguyen, Kenneth Hibbard, and L.J. Chambliss. Previously unrecognized specimens from Floridain the FSCA go back to 1957, when a specimen was collected at Snapper Creek Boy Scout Camp (Miami- Dade County) by sweeping  Celtis. The exact date is unclear on the label, and no collector is mentioned. We have records, but no specimens, from Jacksonville (Duval County) collected 15.viii.1997(FSCA# E1997-3281), Lake Jem (Lake County) collected 28.vii.1997(FSCA# E1997-3438). The most recent collection was in Ft. Myers (Lee County) in June 2005, consisting of 6 empty lerps (FSCA# E2005-2972).   Host plants.  Celtis laevigataWilld. (Cannabaceae).   Comments.In Louisiana, major dieback of stands of C. laevigatawas attributed to high populations of T.  flava( Solomon et al. 1997). In Florida, no similar destruction of trees was observed, possibly because of a native parasite,  Aprostocetus gelastus(Burks, 1943) (Eulophidae), that controlled psyllid populations ( Halbert 1997a). More recently, the Asian aphid,  Shivaphis celtiDas, 1918, ( Aphididae) has become established on C. laevigatain Florida( Halbert et al. 2000). This aphid is very abundant and may prevent build-up of populations of T. flava, which, based on submitted samples, has been rare since the establishment of S. celtiin Florida.   Rhinocolinae Vondráček, 1957    TainarysBrèthes, 1920