LOCU8TIDJ2. 433 



The family of Acanthodidae begin with the following genus. 



Genus 129. POLYANCISTRUS. 



Polyancistrus, Sen. Rev. 57 Hist. Orth. 534. Brittle, Hist. Nat. Ins. ix- 

 Lobodes, Fisch. de W. Bull. Mosc. 1846, 479. 



1. POLYANCISTRUS SEKRULATUS. 



Locusta serrulata, Pal. Beauv. Ins. 218; Orth. pi. 7, f. 2 Polyancistrus 

 serrulalus, Serv. Rev. 57; Hist. Orth. 535 Lobodes rubricornis, Fisch. 

 de W. Bull. Mosc. 1846. 



a. St. Domingo. From Mr. Tweedie's collection. 



Genus 130. ZACATULA. 



Mas. Corpus sat gracile. Caput laeve, carinulis duabus antice ap- 

 proximatis; frons fere plana. Oculi rotundi, valde approximaii. Antennae 

 longissimae, gracillimaB. Prothorax rugosus, planus ; carinae laterales ob- 

 tuse quadridentatae, bene determinatae. Pectoris latera irispinosa; pro- 

 sternum, mesosterauin et nietasternuin bispinosa. Lamina supra-analis 

 brevis, lata. Cerci lanceolati, arcuati. Lamina subgenitalis lata, subtus 

 carinata, stylis duobus lanceolatis. Pedes robusti, longiusculi, fortiter 

 spinosi. Alae anticae sat angustae, apice rotundatae, subtiliter reticulatae, 

 areolis nonnullis magnis, costa fere recta, margine interiore vix rotundato. 

 Ala? posticae paullo breviores. 



Male. Body rather slender. Head smooth, as broad as the fore border 

 of the prothorax; two keels in front of the vertex converging forward, where 

 they are parted by a transverse suture from the slightly rounded border of 

 the front between the eyes; front erect, nearly flat. Eyes round, extremely 

 prominent. Fourth joint of the maxillary palpi much shorter than the 

 third and about half the length of the fifth, which is subclarate. Labial 

 palpi with the usual structure. Antennae very slender, much more than 

 twice the length of the body. Prothorax rugose, flat, slightly widening 

 hindward; two slight transverse impressed lines; lateral keels well defined, 

 with four rounded prominent teeth on each ; fore border and hind border 

 almost straight ; lateral lobes slightly rounded, with an elevated rim. 

 Pectus with three spines on each side near the lateral lobe. Prosternum, 

 mesosternum and metasiernum with a spine on each side. Supra-anal 

 lamina broad, short. Cerci lanceolate, curved. Subgenital lamina broad, 

 keeled beneath, with two lanceolate styles. Legs stout, rather long ; spines 

 stout ; four anterior femora with five or six spines on the outer side; hind 

 femora with two rows of spines, more than two-thirds of the length of the 

 fore wings ; four anterior tibiae with a few minute spines ; hind tibiae with 

 four rows of spines, of which those on the two lower keels are few and 

 minute. Fore wings rather narrow, minutely reticulated, rounded at the 

 tips, longer than the body, a little longer than the hind wings ; areolets 

 few, large, quadrilateral ; scapular vein diverging slightly from the externo- 

 medial in the exterior part, the space between them reticulated and without 

 regular areolets; interno-medial vein hardly undulating; costa almost 

 straight ; interior border very slightly rounded. 



