1G2 TUYNNin.T:. 



beneath the wings, the tcguljc, the scutellum, postscutolliim, and 

 the metathorax laterally at its apex, yellow ; the wings hyaline, 

 the norvuros black ; tho'lcgs IVrruginoiw, the coxtc black. Abdomen 

 shining; the apical margins of the segments depressed; the iirst 

 and fifth segments with narrow interrnpted fascia), the second, 

 third, and fonrth segments with intcriiii)ted broader fasciae; 

 beneatli with three more or less interrupted fascia;, these are 

 sometimes reduced to spots. 



Hah. Swan River, Champion Bay. 



12. Thyimus oppositus. 



Male. Length 7| lines. — Black ; the abdomen with a double row 

 of ovate yellow spots above and also beneath. The clypcils trun- 

 cate, its anterior margin and also the mandibles yellow ; the pubes- 

 cence on the head and thorax white ; the tips of the femora, the 

 tibia), and tarsi yellow ; wings fulvo-hyaline, the nervures black. 

 Abdomen narrowed and rounded at the base ; the apical segment 

 yellow ; the second and four following segments with a large sub- 

 ovate lateral macula; beneath, the segments have similar rows 

 of maeuhe ; the terminal ventral segment with an acute spine at 

 the apex; the margin of the basal segment tuberculatc in the 

 middle. 



Hah. Swan Eiver. 



In the type specimen the legs and the nervures at the base of the 

 wings appear to have been changed from yeUow to red by cyanide 

 of potassium, used in collecting. 



13. Thyimus irregularis. 



Male. Length 6 lines. — Black ; the head and thorax with a few 

 minute yellow maculae ; the abdomen with irregularly shaped quad- 

 rate macula) laterally, and two rows of smaller macula) within. 

 Head very closely punctured ; the mandibles, the margins of the 

 clypeus, an oblong spot at its base, a small ovate spot above each 

 antenna, a narrow line at the inner margins of the eyes, as well 

 as a short one behind them, towards the mandibles, yellow. 

 A narrow line on the anterior margin of- the prothorax, a short 

 line in the middle of the mesothorax and at the margin of the scu- 

 tellum, and a minute spot on the postscutellum, yellow ; wings 

 subhyaline, the nervures black. Abdomen with subquadrate ma- 

 culae laterally, and between these two rows of small lunate or 

 hooked-shaped spots close to the apical margins of the segments ; 

 on the basal segment these spots unite with the lateral ones ; 

 beneath, the second, third, and fourth segments have each two 

 large white ovate maculae, the maculae having a transverse curved 

 black line. 



Hah. Swan River. 



