BY THOMAS G. SLOANE. 333 



D. volitans Macl., is very closely allied to D. undulata, but 

 has the sculpture everywhere finer. It makes its appearance 

 further to the north than D. undulata (Port Denison and Towns- 

 ville). I do not know the limits of the range of D. undulata 

 northward, but it seems to me probable that, if the ranges of D. 

 undulata and D. volitans meet or overlap, there may be great 

 difficulty in differentiating these species where they are found 

 together. Dr. W. Horn has informed me recently that, from 

 material obtained since he described D. Icevisculpta, he now con- 

 siders that name must become a synonym of D. volitans. A 

 specimen (£) in the National Museum, Melbourne, ticketed 

 Queensland, has the humeral macula reduced to merely a little 

 dot, so that the elytra before the median fascia appear at a casual 

 glance quite black. 



D. Jlavicans Chaudoir ( = D. cursitans Macl. = D. strangei Cast. ) 

 is a much smaller species than D. undulata and D. volita?is, and 

 has the sculpture finer, especially near the base. Its most dis- 

 tinctive character is to have the posterior lateral tooth of the 

 labrum placed much further forward than in the other species of 

 the genus. It has the labrum with the central testaceous part 

 very wide; elytra with base testaceous; palpi in male pale testa- 

 ceous with the apical joint merely infuscate at apex. With the 

 material before me I am not prepared to separate D. mastersi 

 Macl., from D. jlavicans Chaud., yet I would not declare definitely 

 that these names are synonymous. 



D. gruti Pasc.*( = Z). plustchevskyi Dokht., = D. interrupta 

 Dokht., and D. pascoei Macl.). I place under D. gruti Pasc, all 

 the forms that I have seen without any apical maculae (excepting 

 the distinct species D. parva Macl.). The typical form has the 

 elytra dark cyaneous black, each elytron 5-maculate, as shown 

 in fig.69 (but with inner basal macula larger, as in fig. 68). 

 Pascoe's description is founded on the female, as is shown by his 

 describing the palpi as " black, second and third joints of the 



* D. papuana Gestro, is allied to D. gruti Pasc; cf. Horn, Deutsche Ent. 

 Zeit. 1893, p. 331. It is the only extra-Australian species known. 



