Coreid Bugs
Wingless Coreid

Large Squash Bug - Mictis caja

Family Coreidae

This page contains pictures and information about Large Squash Bugs that we found in the Brisbane area, Queensland, Australia.

Female, body length 25mm
We first found this large clown bugs along Bulimba Creek in Yugarapul Park during mid summer season. Then we found that this bug is fairy common along Bulimba Creek during summer season on host plants. They are the largest bugs we found in the Coreidae family. The bugs are dull brown in colour, with strong hind legs and round shoulder. Antenna tip-segments are orange colour. 
wpeA.jpg (26144 bytes)
Males have slender body and stronger spiny hind legs. 
DSC_4062.jpg (191560 bytes) DSC_4064.jpg (109158 bytes) wpe8.jpg (52938 bytes)
Females have wider abdomen., otherwise look the same as male.
DSC_4071.jpg (146516 bytes) DSC_4064a.jpg (187703 bytes)
When disturbed, they will eject strong repellent odours. Notice the small hole between its front and 2nd legs, was used as the outlet. 
The bugs was found on different plants so we believed the bug uses many different plants as their host plants.

1st instars

Early summer to late summer, near Bulimba Creek in Yugarapul Park, We found quite a number of nymph, but cannot see any adults on the same host plants. Although adults were also found during the summer season.
DSC_1724.jpg (85889 bytes) DSC_1726.jpg (92078 bytes)

2nd instars

DSC_1193.jpg (203325 bytes) DSC_1194.jpg (221535 bytes) wpe12.jpg (30478 bytes)
Body length 6mm               

3rd instars

DSC_4021.jpg (141230 bytes) DSC_4023.jpg (106176 bytes)
Notice those young instars have the board pairs of front legs.

4th instars

wpeA.jpg (20629 bytes) DSC_4044.jpg (139490 bytes) DSC_3996.jpg (130933 bytes)
Body length 15mm
DSC_4000.jpg (146259 bytes) 

Last instars

wpe19.jpg (33771 bytes) DSC_3991.jpg (164968 bytes) DSC_3992.jpg (157618 bytes)
Body length 20mm  
wpe17.jpg (28890 bytes) DSC_3903.jpg (111648 bytes) DSC_3945.jpg (91730 bytes)
DSC_4019.jpg (151431 bytes) DSC_4025.jpg (126517 bytes) DSC_4027.jpg (106724 bytes)
DSC_4032.jpg (82019 bytes) 
Notice that their front pair of legs reduced but the hind legs enlarged. The last instars have the same shape and round shoulder as the adults.

Host Plants

Annual Ragweed
DSC_3977.jpg (279017 bytes) 
Ambrosia artemisiifolia, weed, native of North America
Their host plants include Easter Cassia plant seedpod (Senna pendula, weeds), Monkey Rope plants (Parsonsia straminea), Solanacea (nightshades, weed) and this Annual Ragweed.

1. Mictis caja Stål, 1865 - Types of Heteroptera, Swedish Museum of Natural History, 2008.
2. Wildlife of Tropical North Queensland - Queensland Museum Publications 2000, p90.
3. Annual Ragweed - Weed Identification, Australian Weeds Committee, 2008.  
4. Studies on the biology, immature stages, and relative growth of some Australian bugs of the superfamily Coreoidea (Hemiptera: Heteroptera) - Kumar, R. 1966, Australian Journal of Zoology 14: 895-991 [908].

Back to top

Up ] Crusader Bug ] [ Large Squash Bug ] Armoured Tip-wilter ]



See us in our Home page. Download large pictures in our Wallpaper web page. Give us comments in our Guest Book, or send email to us. A great way to support us is to buy the CD from us.  
Last updated: September 04, 2010.