Id- n'33 



439. 

 ACRYDIUM SUBULATUM. 



Order Orlhoptera. Fam. Gryllidae or Locustidse. 



Type of the Genus, Gryllus bipunctatus Linn. 

 AcBYDiuM Geoff., Fab., Curt. — Tetrix Lat. — Gryllus (Bulla) Linn. 

 Antenna inserted close to and between the eyes, approximating, 

 short, subfusiform and 15-jointed : basal joint stout and ovate, 

 2nd globose, 3rd longer than the two following, the 4th being the 

 smallest joint, 6th and 7th shorter than the remainder which are 

 rather broader, 14th joint minute, 15th pear-shaped (1). 

 Labrum orbicular (2). 



Mandibles short and subtrigonate, one with 4 teeth at the apex 

 and a large broad striated one near the middle (3) ; the other 

 with 3 apical teeth and a smaller obtuse one at the middle. 

 Maxilla long, horny, narrow, curved and trifid at the apex, with 

 an equally long external lobe, attenuated, with 2 or 3 articula- 

 tions or transverse sutures and terminated by a minute fleshy 

 apex. Palpi longer than the lobes, filiform, 5 -jointed, slightly 

 pilose, basal joint scarcely longer than the 2nd which is the 

 smallest, 3rd and 4th nearly of equal length, 5 th a little the 

 longest and slightly thickened and truncated at the apex (4). 

 Mentum subtrapezate, truncated before, very concave behind. 

 Lip large, forming a cup on the inside, composed of 2 conniving 

 lobes above, united at their base, with 2 small lobes between 

 them towards the apex. Palpi attached to 2 scapes at the 

 anterior angles of the mentum, triarticulate, 1st and 2nd joints 

 short, 3rd as long as the other 2, stouter clavate and pilose, 

 terminated by a vesicle (5). 

 Mouth received into the anterior margin of the antepectus. Head with 

 the crown short bounded by a sharp semicircular margin : face very 

 long and ovate, with a grooved keel down the centre (1*) : eyes sub- 

 globose, slightly prominent. Ocelli 3, two above and one beloio the 

 antenna. Thorax forming a narrow band, with a keel down the 

 centre ; scutellum sometimes much longer than the body, trigonate- 

 lanceolate, keeled down the back and acute at the apex. Abdomen 

 with 2 horny conical lobes at the apex in the males, terminated by 4 

 serrated acute lobes in the females (7). Wings, superior mz'wM^e, 

 appearing as if turned round, someivhat reticulated, with 2 elevated 

 lines crossing each obliquely (9). Inferior varying in size, sometimes 

 very ample, folded like a fan and concealed under the scutellum (which 

 affords them the j)rotection the elytra cannot), supported by numerous 

 radiating nervures connected by short transverse ones, the edges cre- 

 nated. Legs, posterior very long : thighs dilated, ovate, attenuate^ 

 to the apex : tibiae with a double series of teeth on the upper edge 

 and armed with strong spines at the apex : tarsi triarticulate, basal 

 joint long with 2 notches beneath, 2nd joint tninute, 3rc? long, cla- 

 vate (8 1) : claws acute loith a tooth beneath near the base : the 

 other legs are short and simple, with the 1st and 2nd joints of the 

 tarsi small. Pulvilli none. 



SuBULATUM Linn. Faun. Suec. 236. 865. — Curt. Guide, Gen. 451. 1. 

 In the Author's and other Cabinets. 



