20 — 



die einzelnen Formen, wenn gewünscht, hiernach zu 

 bezeichnen, nicht aber auf unbestimmte und schwan- 

 kende, an den verschiedensten Orten wiederkehren- 

 de äußere Kennzeichen. Damit würde der unmäßigen 

 Zersplitterung der Bezeichnungen vorgebeugt und 

 Mißdeutungen verhütet. 



57. 28 Locusta 



Descriptions of the Postemtoryonic 

 Stages of Locusta aiistralis Briinner v. W. 



(Contribution No. 7, Entomological Laboratory, Sugar 



Experiment Stations, Mackay, Queensland.) 



By A. A. GirauU. 



The following descriptions are drawn up so as to 

 enable the identification of the young of this species 

 heretofore not possible. The egg still remains uni- 

 dentificable. In general, the coloration of the young 

 resembles that of the adult. 



Stadium I. 



Length, 6 — 7 mm. Greatest width of head, L65 

 mm. Greneral color dark, mottled with greyish. 

 Eyes reddish. A broad dark stripe across median 

 line of vertex its centre with a narrow greyish line; 

 a similar stripe on each side from the eye margin to 

 the posterior margin of the head (all three stripes 

 sometimes obscure). Cheeks and clypeus sometimes 

 lighter yellowish and mottled or else the whole head 

 so excepting the stripes on vertex. Femora and tibiae 

 with more or less obscure transverse greyish bandings. 

 Abdomen with a broad dark spiracular or lateral 

 stripe. Lateral stripe from posterior margin of eye 

 continued over the pronotum, on each side of the 

 meson and more narrowly and obscurely along the 

 whole abdomen. Pronotum and abdomen finely ca- 

 rinated along the median Une. Posterior tibiae dark. 

 Lateral, pronotum with longitudinal greyish streaks 

 originating at the posterior margin. A more or less 

 obscure dorsilateral greyish stripe on abdomen separa- 

 ting the broader, dark spiracular and dorsal (or mesal) 

 stripes. Tarsi 3-, apparently 4-jointed, the two appa- 

 rent intermediate joints subequal, shortest, in the 

 cephalic or intermediate legs more plainly 3-jointed, 

 the intermediate joints short but four joint pads are 

 evident. Antennae 13-jointed, the distal five joints 

 short, each a half or less the length of any of the 

 preceding six joints, the two proximal joints also 

 short; joint 3 longest and then 6, 7 and 8. Body den- 

 sely, finely polygonally reticulated, including the 

 antennae. Claws and pulvillus well developed. Wings- 

 pads not visible. 



Nelson, North Queensland, April 16, 30, 1912; 

 May 8, 10, 1912. 



Characteristics: 13-jointed antennae ; mo- 

 re obscure and darker coloration; head ^vidth; ob- 

 scurely banded legs; one or more transverse distal 

 antennal joints and the relative length of the antennal 

 joints. Stadium II. 



— Length, 9 — 9,5 mm. Greatest width of head, 

 2,50 mm. The same but the head now all hghter, 

 brownish or pinkish yellow or ochreous andobscurely 

 mottled, the stripe from the posterior margin of 



the eye emphasized, especially its mesal dark por- 

 tion and its central ochreous hne; also the median 

 stripe of the vertex. They all vary somewhat, being 

 more or less distinct as the case may be. But the 

 stripe along each side of the carinate meson of the 

 pronotum and abdomen is now velvety black and 

 conspicuous while ventrad of it, the pronotum is 

 like the head, ochreous and more or less mottled. 

 From the cephahc margin of the pronotum, in the 

 centre of the dark stripe, there is a short comma- 

 Uke ochreous dash, in reality a slight prolongation of 

 the central ochreous line of the dark stripe from the 

 posterior margin of the eye; occasionally, there is a 

 second smaller dash more mesad. The meson is very 

 narrowly ochreous. The legs are usually wholly dark 

 except the posterior femora whose fine longitudinal 

 ridges are ochreous. The cephalic and intermediate 

 tarsi are more distinctly 3-segmented. Antennae 19- 

 jointed, the third joint longest, then the fourth, then 

 the fourteenth; none of the joints are transverse. 

 Eyes red. Wingpads very small but present. 



Nelson, North Queensland, April 30, 1912; May 

 6, 10, 24, 1912. 



Ch aracteristics: 19-jointed antennae, the 

 third and fourth joints longest; more definite color 

 pattern; head width; usually uniformly dark colored 

 legs; the absence of transverse antennal joints and 

 the presence of the minute wing pads. 

 Stadium III. 



— Length, 14 — 18 mm. Greatest width head, 

 3,5 mm. The same as the preceding stage but 

 the posterior tibiae are brownish in their middle 

 as are also portions of the femora and tibiae of 

 the first two pairs of legs. The vertex may be 

 intensely black, obscuring its median h'ne. Antennae 

 with joints 3 and 4 divided, making 21 joints in all; 

 joint 3 longest, then 8, 12, 16, 17 and 21 ; many 

 of the joints quadrate but none transverse; third 

 joint one and two thirds times the length of joint 4. 

 Sometimes, there are only 20 joints when 3 and 5 

 become subequal, the latter undivided. Eyes oliva- 

 ceous. Wing pads still adhering to the dorsum like 

 flat plates. 



Nelson, North Queensland, May 10, 1912. 



Characteristics: 20 — 21-jointed antennae ; 

 brownish on the legs; head width and large wing 

 pads; non-reddish eyes. 



Stachum IV. 



— Length, variable, from about 15 to 25 

 mm. Greatest width of head, 4.5 mm. Still more 

 decidedly colored, black and rufous or nearly; legs 

 nearly all rufous except the tarsi, spotted with 

 black dots. Vertex all black, its median line very 

 narrow. The same as in the preceding stage. Wing 

 pads now free and in the position assumed when 

 adult, somewhat longer than wide, reaching only to 

 distal third of segment of the abdomen 2. 



Antennae 22-jointed, joints 5 and 11 — ^15 longest, 

 the third joint longer than the fourth and some- 

 times subequal to joint 5. A more or less abscure. 

 velvety black longitudinal line in the middle of the 

 vertex on each side of the median line. Eyes dark red. 



to be continued. 



Redaktion : M. Rühl, Zürich V. — Verlag des Seitz'schen Werkes (Alfred Kernen), Stuttgart. 



Druck von H. Laupp jr. Tübingen. 



